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.
Answer
Your best option in terms of performance would be to use rsync from the command shell on your NAS to sync NAS HDD to one of your external drives. In other words, you would plug your internal drive, then rsync NAS HDD onto that drive and take latter offsite.
Alternatively, you can do the same from any machine that has an access to NAS, but when a file will be copied from NAS to ext. HDD, it will go through this machine. Not ideal in performance terms, but might be easier to set up if you aren't comfortable with NAS shell. For this option, the keywords you are looking for is folder backup or folder sync. Assuming you are on Windows, you can look at FreeFileSync (make sure to use older versions that aren't bundled with adware), Bvckup 2 or SyncBack SE. You can also use Windows own robocopy with /MIR flag if you want zero dependency on anything outside of bare OS.
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