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System Restore is a component of Microsoft's Windows Me, Windows XP, Windows Vista and Windows 7, but not Windows 2000,[1] operating systems that allows for the rolling back of system files, registry keys, installed programs, etc., to a previous state in the event of system malfunction or failure.
The Windows Server operating system family does not include System Restore. The System Restore built into Windows XP can be installed on a Windows Server 2003 machine,[2] although this is not supported by Microsoft.
In Windows Vista and later versions, System Restore has an improved interface and is based on Shadow Copy technology. In prior Windows versions it was based on a file filter that watched changes for a certain set of file extensions, and then copied files before they were overwritten.[3] Shadow Copy has the advantage that block-level changes in files located in any directory on the volume can be monitored and backed up regardless of their location.
System Restore is a component of Microsoft's Windows Me, Windows XP, Windows Vista and Windows 7, but not Windows 2000,[1] operating systems that allows for the rolling back of system files, registry keys, installed programs, etc., to a previous state in the event of system malfunction or failure.
The Windows Server operating system family does not include System Restore. The System Restore built into Windows XP can be installed on a Windows Server 2003 machine,[2] although this is not supported by Microsoft.
In Windows Vista and later versions, System Restore has an improved interface and is based on Shadow Copy technology. In prior Windows versions it was based on a file filter that watched changes for a certain set of file extensions, and then copied files before they were overwritten.[3] Shadow Copy has the advantage that block-level changes in files located in any directory on the volume can be monitored and backed up regardless of their location.
Overview
In System Restore, the may create a new restore point manually, roll back to an existing restore point, or change the System Restore configuration. Moreover, the restore itself can be undone. Old restore points are discarded in order to keep the volume's usage within the specified amount. For many users, this can provide restore points covering the past several weeks. Users concerned with performance or space usage may also opt to disable System Restore entirely. Files stored on volumes not monitored by System Restore are never backed up or restored.
System Restore backs up system files of certain extensions (.exe, .dll, etc.) and saves them for later recovery and use.It also backs up the registry and most drivers.
Resources monitored
The following resources are backed up:
- Registry
- Files in the Windows File Protection (Dllcache) folder
- Local user profile
- COM+ and WMI Databases
- IIS Metabase
- Specific file types monitored
Restore points
Restore points are created:- When software is installed using the Windows Installer, Package Installer or other installers which are aware of System Restore.[7]
- When Windows Update installs new updates to Windows.
- When the user installs a driver that is not digitally signed by Windows Hardware Quality Labs.
- Every 24 hours of computer use[7] (10 hours in Windows Me), or every 24 hours of calendar time, whichever happens first. This setting is configurable through the registry or using the deployment tools. Such a restore point is known as a system checkpoint. System Restore requires Task Scheduler to create system checkpoints. Moreover, system checkpoints are only created if the system is idle for a certain amount of time.[6]
- When the operating system starts after being off for more than 24 hours.
- When the user requests it. On Windows Vista, shadow copies created during File Backup and Complete PC Backup can also be used as restore points.[4]
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