Limitations & Complications
A limitation which applies to System Restore in Windows versions prior to Windows Vista is that only certain file types and files in certain locations on the volume are monitored, therefore unwanted software installations and especially in-place software upgrades may be incompletely reverted by System Restore. Consequently, there may be little or no practical beneficial impact. Certain issues may also arise when attempting to run or completely uninstall that application. In contrast, various other utilities have been designed to provide much more complete reversal of system changes including software upgrades. However, beginning with Windows Vista, System Restore monitors all system file types on all file paths on a given volume, so there is no issue of incomplete restoration.
It is not possible to create a permanent restore point. All restore points will eventually be deleted after the time specified in the RPLifeInterval registry setting is reached or earlier if allotted disk space is insufficient. Even if no user or software triggered restore points are generated allotted disk space is consumed by automatic restore points. Consequently, in systems with little space allocated, if a user does not notice a new problem within a few days, it may be too late to restore to a configuration from before the problem arose.
For data integrity purposes, System Restore does not allow other applications or users to modify or delete files in the directory where the restore points are saved. On NTFS volumes, the Restore Points are protected using ACLs. Since its method of backup is fairly simplistic, it may end up archiving malware such as viruses, for example in a restore point created before using antivirus software to clean an infection. Antivirus software is usually unable to remove infected files from System Restore; the only way actually to delete the infected files is to disable System Restore, which will result in losing all saved restore points; otherwise they will remain until Windows deletes the affected restore points. However stored infected files in themselves are harmless unless executed; they will only pose a threat if the affected restore point is reinstated. Windows System Restore is not contemptible with restore points made by third party applications.
Changes made to a volume from another OS (in case of dual-boot OS scenarios) cannot be monitored. Also, a compatibility issue exists with System Restore when dual-booting Windows XP/Windows Server 2003 and Windows Vista or later operating systems which makes System Restore unusable in a dual-boot scenario. Specifically, the shadow copies on the volume are deleted when the older operating system accesses (and therefore mounts) that NTFS volume. This happens because the older operating system does not recognize the newer format of persistent shadow copies.
Read more about this topic: System Restore
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