It stores the various properties of the files in each directory (Created, Accessed, modified dates, owner, group, permissions, Windows ACL if present) and dumps it to a file in the same directory, then that file gets backed up along with the other files in the directory. After it's copied all the files that temporary file gets deleted from the directory being backed up.
It seems that creating this file is taking the time rather than transferring it. And this has to be done for every directory even if no files were changed.
If you're not worried about being able to restore file dates, owners, permissions, etc. then un-check the box.
...defiantly mixing and matching drive manufacturers to avoid getting 3 duff drives that fail in the same month...
DS410: Seagate Barracuda ST31000528AS, Hitachi Deckstar HDS721010CLA332, Samsung SpinPoint HD103SJ.
All 1TB capacity, 32Mb buffer in RAID5
Enjoying music streamed to my Linn Majik DS