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Plan for backup and recovery (SharePoint Foundation 2010)

 

Applies to: SharePoint Foundation 2010

Topic Last Modified: 2011-08-08

This article describes the stages involved in planning for backup and recovery, which include determining backup and recovery strategies for a Microsoft SharePoint Foundation environment and deciding which tools to use. The stages do not have to be done in the order listed, and the process may be iterative.

When you plan for how you will use backup and recovery for disaster recovery, consider common events, failures, and errors; local emergencies; and regional emergencies.

importantImportant
The SharePoint 2010 Service Pack 1 (SP1) upgrade process alters the schema of some of the farm databases and all content databases. Because of these changes, you might need to take additional steps to restore a backup that you made before the farm was upgraded to SP1 to the farm after it is upgraded to SP1. For more information about doing this, see Restore pre-SP1 backups to an SP1 farm (SharePoint Foundation 2010).

For detailed information about Microsoft SharePoint Foundation backup and recovery, see Backup and recovery overview (SharePoint Foundation 2010).

In this article:

To define business requirements, determine the following for each farm and service in the environment:

  • Recovery point objective (RPO) is the objective for the maximum time period between the last available backup and any potential failure point. It is determined by how much data that the business can afford to lose if a failure were to occur.

  • Recovery time objective (RTO) is the objective for the maximum time that a data recovery process will take. It is determined by the time the business can afford for the site or service to be unavailable.

  • Recovery level objective (RLO) is the objective that defines the granularity with which you must be able to recover data — whether you must be able to recover the whole farm, Web application, site collection, site, list or library, or item.

Shorter RPO and RTO, and finer granularity of RLO, all typically cost more.

A worksheet to help you plan your strategies for backup and recovery for your SharePoint Foundation 2010 environment can be downloaded from SharePoint 2010 Products backup and recovery planning workbook (http://go.microsoft.com/fwlink/p/?LinkID=184385).

Your business requirements will help you determine which components of the environment that you must protect, and the granularity with which you have to be able to recover them.

The following table lists components of a SharePoint environment that you might decide to protect, and the tools that can be used to back up and recover each component.

 

Component SharePoint backup Microsoft SQL Server 2008 R2 Express System Center Data Protection Manager (DPM) 2010 File system backup

Farm

Yes

Yes6

Service applications

Yes

Web application

Yes

 

Content databases

Yes

Yes

Yes

Site collection

Yes1, 2

Yes1, 2

Yes1, 2

Site

Yes2

Yes2

Yes

Document library or list

Yes2

Yes2

Yes

List item or document

Yes

Content stored in remote BLOB stores

Yes3

Yes3

No3

Customizations deployed as solution packages

Yes7

Yes7

Yes6, 7

Changes to Web.config made by using Central Administration or an API

Yes

Yes

Yes4

Configuration settings (SharePoint)

Yes2, 8

Yes2, 8

Yes 2, 9

Customizations not deployed as solution packages

Yes. Files can be recovered if protected as files.4, 5

Yes

Changes to Web.config not made by using Central administration or an API

Yes4

Yes

IIS configurations not set through SharePoint

Yes5

Yes

SQL Server Reporting Services databases

Yes

Yes

1Farm-level and database-level backup and restore can be used for site collection recovery if a single site collection is stored in a database.

2Farm-level and database-level backups can be used with SharePoint Foundation unattached database recovery to restore site collections, sites, lists, and configurations.

3Content stored in remote BLOB stores cannot be restored by using DPM.

4Changes to Web.config can be backed up by using file system backup from DPM 2010.

5IIS configurations can be recovered by using a bare metal backup from DPM 2010.

6DPM 2010 can recover this item by using a combination of a bare metal backup and SharePoint Foundation backup. It cannot be backed up and recovered as an object.

7Fully-trusted solution packages are stored in the configuration database, and sandboxed solutions are stored in content databases. They can be recovered as part of farm or content database recovery.

8Configuration settings can be recovered from farm-level backups. For more information, see Restore a farm (SharePoint Foundation 2010).

9The Central Administration content database and the configuration database for a SharePoint Foundation 2010 farm can be recovered but only as part of a full-farm recovery to the same farm, with the same computers.

noteNote
You can register SharePoint Foundation 2010 with Windows Server Backup by using the stsadm.exe -o -registerwsswriter operation to configure the Volume Shadow Copy Service (VSS) writer for SharePoint Foundation. Windows Server Backup then includes SharePoint Foundation 2010 in server-wide backups. When you restore from a Windows Server backup, you can select Microsoft SharePoint Foundation (regardless of which version of SharePoint 2010 Products is installed), and all components reported by the VSS writer for SharePoint Foundation 2010 on that server at the time of the backup will be restored.
Windows Server Backup is recommended only for use with for single-server deployments.

From within a content database, you can recover site collections, sites, lists and libraries.

Backup and recovery tools provide different levels of recovery for content within a content database. Recovering an object from within a content database is always more complex than recovering the whole content database.

Customizations to SharePoint sites can include the following:

  • Master pages, page layouts and cascading style sheets. These objects are stored in the content database for a Web application.

  • Web Parts, site or list definitions, custom columns, new content types, custom fields, custom actions, coded workflows, or workflow activities and conditions.

  • Third-party solutions and their associated binary files and registry keys, such as IFilters.

  • Changes to standard XML files.

  • Custom site definitions (Webtemp.xml).

  • Changes to the Web.config file.

How customizations are deployed, and how changes are made to the Web.config file, have a significant effect on which tools can be used to back up and recover customizations. To provide the greatest opportunity for recovery, we recommend that you deploy customizations by using solution packages and configure the Web.config file by using Central Administration or the SharePoint APIs and object model.

Workflows are a special case of customizations that you can back up and recover. Make sure that your backup and recovery plan addresses any of the following scenarios that apply to your environment:

  • Declarative workflows, such as those that you created in Microsoft SharePoint Designer 2010, are stored in the content database for the site collection to which they are deployed. Backing up the content database protects these workflows.

  • Custom declarative workflow actions have components in the following three locations:

    1. The Visual Studio assemblies for the Activities are stored in the global assembly catalog (GAC).

    2. The XML definition files (.ACTIONS files) are stored in the 14\TEMPLATE\{LCID}\Workflow directory.

    3. An XML entry to mark the activity as an authorized type is stored in the Web.config file for the Web applications in which it is used.

    If your farm workflows use custom actions, you should use a file backup system to protect these files and XML entries. Similar to SharePoint Foundation features such as Web Parts and event receivers, these files should be reapplied to the farm as needed after recovery.

  • Workflows that depend on custom code, such as those that are created by using Visual Studio, are stored in two locations. The Visual Studio assemblies for the workflow are stored in the global assembly catalog (GAC), and the XML definition files are stored in the Features directory. This is the same as other kinds of SharePoint Foundation features such as Web Parts and event receivers. If the workflow was installed as part of a solution package, backing up the content database protects these workflows.

  • If you create a custom workflow that interacts with a site collection other than the one where the workflow is deployed, you must back up both site collections to protect the workflow. This includes workflows that write to a history list or other custom list in another site collection. Performing a farm backup is sufficient to back up all site collections in the farm and all workflows that are associated with them.

  • Workflows that are not yet deployed must be backed up and restored separately like any other data file. When you are developing a new workflow but have not yet deployed it to the SharePoint Foundation farm, make sure that you back up the folder where you store your workflow project files by using Windows Backup or another file system backup application.

Service applications in a SharePoint Foundation environment can be made up of both service settings and one or more databases, or only service settings. You cannot restore a complete service application by restoring the database only. However, you can restore the databases for a service application and then provision the service application. For more information, see Restore a service application (SharePoint Foundation 2010).

SharePoint Foundation backup and recovery does not include SQL Server Reporting Services databases. You must use SQL Server 2008 R2 Express tools. For more information, see Backup and Restore Operations for a Reporting Services Installation (http://go.microsoft.com/fwlink/p/?LinkId=186642).

To select the correct tools for backup and recovery, you must determine whether you can meet the continuity requirements that you have set for your business within your budget for time and resources.

Key things to consider when you select tools include the following:

  • Speed of backup: Can the tool perform within the maintenance window for your databases? You should test any backup system to ensure that it meets your needs on your hardware.

  • Completeness of recovery.

  • Granularity of objects that can be recovered.

  • Backup type supported (full, differential, or incremental).

  • Complexity of managing the tool.

The following table compares the kind of backup and size of farm that can be backed up in a six-hour window for backup and recovery tools available from Microsoft.

 

Tool Backup type Size of backup completed in six hours1

SharePoint farm backup and recovery

Full, differential

600 GB

SQL Server

Full, differential

600 GB

System Center Data Protection Manager

Incremental

Terabytes

1Backup size was determined by backing up a system that totals the specified size on the test hardware listed in the following section.

noteNote
The SharePoint Foundation and SQL Server 2008 R2 Express backups were performed with backup compression turned on.

The following table lists the hardware that was used in the tests that determined the size of backup that could be completed in a six-hour window.

 

Component Description

Processor

64-bit dual processor, 3 GHz

RAM

8 GB

Disk

2 terabyte NTFS file system-formatted partition

Network

100 megabits per second (Mbps) or faster connection between client computers and server

Network share

Network share with 1.25 terabytes free space

noteNote
The upper size limit for performing SharePoint Foundation 2010 site collection backups is 100 GB.

For detailed information about the backup and recovery systems that can be used with Microsoft SharePoint Foundation, see the following resources:

Based on your business requirements, recovery needs, and the tools that you have selected, determine and document the backup and recovery strategies for your environment.

It is common for IT departments that support SharePoint Foundation environments to decide to use more than one tool to protect the environment, as they determine the strategies that they will use.

For example, in an environment that has databases that are managed by DBAs, the strategies in the following list might be employed:

  • All databases are backed up by SQL Server 2008 R2 Express. The backup interval that is set is based on the following:

    • The importance of the content or service.

    • The effect on performance that the backup has on the environment.

  • Small, quickly changing, very high-business-affect content databases are additionally protected by SQL Server 2008 R2 Express database snapshots that are stored on a separate physical disk. Only one snapshot is stored per database, and snapshots are discarded regularly so that the effect on performance is minimized. The snapshot interval that is set for each database is based on the following:

    • The importance of the content or service.

    • The standard rate of change for the database.

    • The effect on performance that the snapshot has on the environment.

    • The amount of space that is required to store the snapshot.

    Recovering from a snapshot is faster than standard recovery because a snapshot, and its underlying database, can be treated by SharePoint Foundation as an unattached database. However, creating snapshots can decrease the performance of the underlying database. We recommend that the effect that snapshots have on the performance of the system be tested before they are implemented, and that snapshots be discarded regularly to reduce the space that is required.

    noteNote
    If you are using RBS, and the RBS provider that you are using does not support snapshots, you cannot use snapshots for backup. For example, the FILESTREAM provider does not support snapshots.
  • SharePoint Foundation backup is used to protect service applications. The backup interval is based on the following:

    • The importance of the service.

    • The standard rate of change for the database.

    • The effect on performance that the backup has on the database.

  • All restore operations are performed through SharePoint Foundation. The choice of which restore system to use is determined by the kind of backup that is available and the object being restored.

Other tools should be part of your business continuity strategy. Consider how you will use Recycle Bins and versioning in site collections throughout the environment. For more information, see Plan for business continuity management (SharePoint Foundation 2010).

As you plan your backup and recovery strategy, consider the following recommendations to help you decrease the effect of backup and recovery on system performance.

By design, most backup jobs consume as many I/O resources as they can to finish the job in the available time for maintenance. Therefore, you might see disk queuing and you might see that all I/O requests come back more slowly than usual. This is typical and should not be considered a problem.

Follow the general recommendations for configuring SQL Server 2008 R2 Express and storage for a SharePoint Foundation environment. For more information, see SQL Server and storage (SharePoint Foundation 2010).

In general, it is best to use a local disk, not a network drive, for backups. If you are backing up multiple servers, you may want to have a directly connected computer that both servers can write to. Network drives that have 1 millisecond or less latency between them and the computers that are running SQL Server 2008 R2 Express will perform well. If your farm has multiple servers in it (including the computer that is running SQL Server 2008 R2 Express), you must use UNC network paths for the SharePoint farm backup location.

Do not run backup jobs during times in which users must have access to the system.

To avoid I/O bottlenecks, perform the main backup to a separate disk, and only then copy to tape.

Consider staggering backups so that not all databases are backed up at the same time.

SharePoint Foundation backups use SQL Server 2008 R2 Express backups. When using compression with your backups, be mindful not to overwhelm SQL Server 2008 R2 Express. For example, some third-party backup tools compress data during backup, which can disrupt SQL Server performance. There are tools available to throttle the compression processes and control the effect on SQL Server.

If you are running SQL Server 2008 Enterprise, we recommend that you use backup compression. For more information, see Backup Compression (SQL Server) (http://go.microsoft.com/fwlink/p/?LinkId=179525).

If you are using SQL Server 2008 R2 Express backups, use a combination of full, differential, and transaction log backups for the full recovery model to minimize recovery time. Differential database backups are usually faster to create than full database backups, and they reduce the amount of transaction log required to recover the database.

If you are using the full recovery model in SQL Server 2008, we recommend that you use the truncate option during backup to avoid maintenance issues.

For detailed recommendations about how to optimize SQL Server 2008 R2 Express backup and restore performance, see Optimizing Backup and Restore Performance in SQL Server (http://go.microsoft.com/fwlink/p/?LinkId=126630).

Carefully consider whether to use redundant array of independent disks (RAID) on your disk backup device. For example, RAID 5 has low write performance, approximately the same speed as for a single disk. (This is because RAID 5 maintains parity information.) Using RAID 10 for a backup device may provide faster backups. For more information about how to use RAID with backups, see Configure RAID for maximum SQL Server I/O throughput (http://go.microsoft.com/fwlink/p/?LinkId=126632).

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