Re: Rsync
I've always thought there should a system where spare capacity (assignable as percentage of free space for example) on workstation / laptop hard disks could be used in some kind of network raid storage used for onsite backups - 100 office computers will nowadays have at least 300GB going spare - why not create a massive pool of storage space where the parity / redundancy exists across say 50% of the computers - 300GB * 100 / 2 = 15TB of storage which could be used for non critical storage of archive data say or previous versions of backups?
Perhaps this BitTorrent technology could be used for the above?