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What does the System Volume Information folder do?

Can you please tell me what the System Volume Information folder is for? I've noticed that on one of my Win2k servers that of the four volumes two have files in a "catalog.wci" folder within the System Volume Info folder. In one case, these total 79GB! I've searched the Microsoft Knowledge Base, but it seems to have a gaping hole concerning the System Volume Info folder.
The System Volume Information folder is used for system restoring your system data in the event of data loss or hardware failure. Catalog.wci, on the other hand, is used by the Indexing Service and contains an index of Web and document content on your hard drive. If you are not using the Indexing Service, you can un-install it through Add/Remove Programs and remove the catalog.wci file.

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