I have a NAS drive with two internal HDs set up in RAID 0 (seen as one complete drive) and two separate external HDs as backups. I plan to keep the backups off site.
This means intermittently I want to copy the new data from the NAS to a third portable HD to the site of my backups and copy the new data over.
Without simply lumping all new stuff into a separate folder
new and then sorting it manually twice (for the NAS and backups) is there a way I can create an image(?) of the backups to compare the NAS contents against and thus only copy the missing (new) files to the third portable HD using the 'sorted' file structure?
On-line remote backup is not an option.