Yes, I know I am dreaming, but...



An open source program, pcbackup or backuppc something like that on
Sourceforge has a very nice feature.



If a file is already backed up, it only keeps one copy of that file for ALL
its clients!  What technique does it use to figure out if the files are
identical without comparing them?  I didn't research it that far, but I
assume it uses something like file size and a checksum of some kind.



Anyway, if you have significantly identical client computer you are backing
up, just keeping one rather than N copies is better than any compression
known to man!  It would be another field or so in the database for every
file, but it might be worth it!  At least as an option.



... Jack