How to alter behavior of System Restore Utility

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There are three specific keys that control behavior of System Restore Utility. It has many values that can be altered and also have some that should not be altered under any circumstances. Microsoft Article The Registry Keys and Values for the System Restore Utility (Q295659) explains it all in detail this but in brief following three keys are important. 1. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Sr2. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Srservice3. HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\CurrentVersion\SystemRestore Only some sub-keys of third key can be modified without harming your computer. Read the Microsoft Article to know what can not be modified.Following keys can be modified (copied from Microsoft Article):CompressionBurst This value, listed in seconds, specifies the idle time compression: The amount of time to compress data after the computer reaches its idle time. A service can compress data for the amount of time that is specified in this value, and then stop. Then, at the next idle time compression, the computer can repeat the process. DiskPercent This value relates to the percentage of disk space that System Restore uses for its data store. The default value is 12 percent. The data store size is always calculated as "max(12 percent, DSMax)," regardless of the size of the hard disk. The maximum (max) size is what is specified in DSMax. For hard disk sizes that are less than 4 gigabytes (GB) in size, 12 percent is less than 400 megabytes (MB), so "max(12 percent, DSMax) equals 400 MB." For hard disk sizes that are greater than 4 GB, 12 percent is greater than 400 MB, so "max(12 percent, DSMax) equals 12 percent." This data store size is not a reserved disk space, and the data store size is used only on demand. DSMax This value specifies the maximum size for the System Restore data store. The default size of the data store is 400 MB. The data store size is always calculated as "max(12 percent, DSMax)," regardless of the size of the hard disk. The maximum (max) size is what is specified in DSMax. For hard disk sizes that are less than 4 GB, 12 percent is less than 400 MB, so "max(12 percent, DSMax) equals 400 MB." For hard disk sizes that are greater than 4 GB, 12 percent is greater than 400 MB, so "max(12 percent, DSMax) equals 12 percent." This data store size is not a reserved disk space, and the data store size is used only on demand. DSMin This value relates to the minimum amount of free disk space that System Restore needs so that it can function during the installation process. Also, this value relates to the minimum amount of free disk space that is needed for System Restore to reactivate and to resume the creation of restore points after System Restore has been disabled because of low disk space. RestoreStatus This value specifies if the last restore operation failed (0), succeeded (1), or had been interrupted (2). RPGlobalInterval This value specifies, in seconds, the amount of time that System Restore waits before it creates the automatic computer check points for elapsed time. The default value is 24 hours. RPLifeInterval This value specifies, in seconds, the restore points Time to Live (TTL). When a restore point reaches this time and it is still on the system, it gets deleted. The default value is (7776000), which will be 90 days. RPSessionInterval This value specifies, in seconds, the amount of time that System Restore waits before it creates the automatic computer check points for session time (the amount of time that the computer has been on). The default value is zero (0), which means that this feature is turned off. ThawInterval This value specifies, in seconds, the amount of time that System Restore waits before it activates itself from a disabled state (after the conditions for this process to occur have been met). If you start the System Restore user interface, System Restore is activated immediately.