I've got a bunch of old disks (about 15 disks, mean age ca. 8 years, mostly USB 2, most less than a TB). Disks marks at least one of them as failing, some Input/Output errors are showing up, rsync also sometimes shows errors when copying. There are numerous file duplicates.
I'd like to coalesce everything on them onto 1 new disk, and then do 1 backup onto a secondary new disk.
Is there an established method of doing this, or do I need to go disk-for-disk using
rsync?Can the method also work if the total data volume before unduplication exceeds target disk volume (but doesn't after unduplication)?
