Counter: RAID is the backup
between your other backups. A backup is, in the end, anything you turn to when you have some kind of failure. Which is appropriate depends on the type of failure. RAID is there for your hardware failures; "tape style" (how
does one phrase this?) is there for your data deletion. (One could argue that a missing tine of the trident would be checksums, for data corruption)
Example: A small company with data they find important but it isn't a great volume and they don't have a huge budget. They do a backup of everything once every week or month (it doesn't matter).
Should a drive fail, the backups could be handy, but who wants to lose days of work? And so people turn to RAID.
Note that as your strategy/need evolves toward continual backups, backup and RAID begin to merge, expensively.