But isn't that exactly what Dropbox does? If I delete a file on my PC, I can go to Dropbox.com and restore it, to some period in the past (I think it depends o

But isn't that exactly what Dropbox does? If I delete a file on my PC, I can go to Dropbox.com and restore it, to some period in the past (I think it depends on what you pay for). In fact, I can see every version that's changed during the retention period and choose which version to restore. Maintaining version history out to a set retention period is a backup...no?