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Windows Server 2003 - File Server System

We have a Windows Server 2003 and it's hosting users' folders.  We are running out of disk space all of a sudden, and we've just found out that there's a "System Volume Information" directory that takes up 120GB of the disk space, with all the files in this structure "{b8eb2f0a-44e5-11e2-8f4e-0024e852fa77}{3808876b-c176-4e48-b7ae-04046e6cc752}"... there are close to 200 files similar to this.  Should I or can I delete these file?  Please advise.  Thanks.

p.s. I think these files are for restoring purposes, but we already have a backup solution in place that does all the backup/restore users' files or folders.
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EMJSR
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You can limit the space used for the System Restore options. Have a look in the configuration for the System Restore and move the slider for the respective drive to a lower setting.

Additionaly go to the HDD Properties (from Windows Explorer) and check the "Shadow Copies" tab. You may have Volume Shadow Copies enabled which essentially will store several previous versions of files. If you turn that down a little (I wouldn't turn it off), so it saves fewer copies, you should be able to free up some space.
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We do not use Shadow Copies.  I just want to make sure that deleting the extra old {xxx##xxx-xxx#####x#-xxx###xxx} files are okay.  Thanks.
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I'm still puzzled on how that "System Volume Information" folders on these "data" drives are getting too huge; and I still don't know what the first part and second part of this string "{b8eb2f0a-44e5-11e2-8f4e-0024e852fa77}{3808876b-c176-4e48-b7ae-04046e6cc752}" represents.  

Anyways, I'll do more research and if I find anything that could explain this, I'll update.  For now, let's close this as nothing is related to "shadow copies", "indexing", or "disk cleanup".
Well, the System Volume Information contains restore points among other things. The long numbers are GUIDs with which Windows can identify properties of the data. That just as a basic explanation.
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There's no restore points configured either.  The only things hosted on these drives are users' folders, etc.  and I can't seem to match the GUID's to any of the users.