Or your computer crashed and you're having to rebuild from a failed backup. Or you're traveling away from your backups and need access. Or you upload from one device and usually download to your archive on another device. There are more scenarios in heaven and earth than I could possibly list here.
That you can't think of a single scenario in which people might want to rely on the previously-uploaded copies of a large binary files is one thing. That you dismiss the several I came up with off the top of my head is another.
