because it examines every block.  bittorrent is supprisingly good at doing this at the expense of having to read every block. ALL block level transfers are going to have this issue because they cant rely on timestamps or filenames etc etc.

IF you want to test bittorents tallents in this, just grab a torrent of a DVD or something.  once you have downloaded the entire DVD, close bittorrent.  Open that file in a hex editor and make a tiny change somewhere.  when you re-open the file in bittorrent it will easily find and correct the damage.


Thinking about the logistics in the method I have thought up a few hurdles.  The source disks must remain unchanged during the entire sync.  You would need to either have a spare disk in a raid1 mirror that you could remove from the array and source from that, or you need to do some more hacking to bittorrent so that it could update the torrent file during the backup to reflect changes(lots of work i think)

Im just throwing out ideas here, hoping something sticks and is helpful.