Backup job copies ALL files instead only changes

Hmmm...I didn't think to check full timestamps beyond seconds. Turns out the NVX (ext3?) stores seconds to a precision of 9 decimal places, while NTFS stores to only 7. If both the standard backup and rsync are checking seconds to greater than 7 decimal points accuracy (e.g., HH:MM:SS.123456789...that's a billionth of a second...i.e., a nanosecond. Seriously??? Isn't ten millionths of second enough???), then I'll have to sync ReadyNAS Share to ReadyNAS USB via a remote computer and take the network hit. Unfortunately, the main backups run at night and these secondary backups are scheduled during the day. That's not a problem when they're isolated to the ReadyNAS, but if I have to copying gigabytes and sometimes terabytes of data across the network TWICE while users are there, the huge network hit will NOT be appreciated.

But before I do that, I'll give rsync a try. Just have to wait until the current backup is done re-copying the 465GB backup file it already started. :-P