As a rule of thumb we reckon 500MB is a comfortable working maximum. An archive may contain many revisions of many files. This in effect limits the maximum size of any contained file. Because Keep-It highly compresses its content, a single file may still be up to 2GB, but practically you should consider 500MB a working maximum. It would be possible to browse archive contents directly from those applications which use the standard Windows File Open dialog, but this might create some potential confusion.
Archives only contain revisions .
As if you changed the revision, but you'd have to save the revision to some place outside the archive. You can open a revision directly while browsing an archive. As if you want to make any changes. This is the most significant compression technique used by Keep-It. If you consider an average 100KB Word document, then storing just the differences of 10 revisions ensures only a fraction of the storage required for ten copies is used.