You have a computer with a drive of 500 GB, and an external drive of 1,000 GB.
You create files on the computer, for things like software, art, music, photos, etc.
You "copy" your best files to the external drive to create a "backup".
It's a backup, because now the files exist in two locations (in case one of the drives fail).
But what if you have files that are not so important, and you only "move" them to the external drive, thus saving space on your computer?
What could that be called to differentiate the files on the external drive that exist in two locations as opposed to the files that only exist in one location?
I was thinking of using the word archive, but that doesn't seem specific enough to differentiate the two categories adequately.