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System Protection Disk Usage

American Zombie

Staff member
Political User
In XP you could adjust the percentage of how much disk space restore could use but I can not seem to find this in Vista. Reason I want to adjust it is I looked at how much space that the drive Vista is on was using and it was about 70GB. I used disk cleanup to remove system restore points except the last one and the drive usage went down to 38GB. System restore/previous versions was taking up 32GB of disk space off the drive which seems a bit much to me. Any place this can be adjusted?


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Political User
Glad it worked, was a good tweak for me too as I hadn't gotten around to looking into that. 15% on large drives is a bit crazy, not sure why they decided to hide being able to change that :eek:

American Zombie

Staff member
Political User
Just found another way to do it without going into the registry. IMO Microsoft should add the slider back in for SP1 so people can choose how much space to use on their computer.

Decrease Storage Space Allocated To System Restore

Edit: I wonder if the registry hack and resizing per the above link are two different things. I changed the percentage in the registry then to make sure it took affect I rebooted. I then opened a command prompt and entered Vssadmin list shadowstorage

The maximum storage space amount was unchanged from before I had changed the registry so I put the registry entry back to 15% then entered in a command prompt vssadmin resize shadowstorage /On=C: /For=C: /Maxsize=10GB

After doing that I checked again by entering Vssadmin list shadowstorage
and the amount was now 10GB for maximum.
Last edited:


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Political User
Interesting indeed.

I'm going to fiddle with this on my home PC tomorrow, I'll post how each one works for me too.

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