An AJC revision archive can hold multiple revisions of the same file in one archive file. The archive file is very compact because it is compressed and only the changes are stored each time a new revision is added. You can then extract files, to undo changes for example or just do comparisons between revisions to see what has changed. You can also create new archives manually, add new revisions delete revisions and add descriptions against revisions.
Windows Server 2008,