A handy option in FileHamster is "MaxSize".
Found in the Options Window accessed through the right-click menu in the
Watch Tree, you can tell FileHamster to not back up any files that are larger than
a specified size (in MegaBytes). Setting this value to a reasonable number, such
as 100MB, might prevent you from needlessly backing up files that will quickly fill
your drive after a few revisions have been made.
This has been found to be especially handy with video editors and when
authoring DVDs.