Hard Drives as Backup Media?

rootus-rootus asks: "I funny thought struck me as I was going over the life expectancy for tape media for backups... Since the size of 3.5" hard disks is surpassing 100GB in a reasonably inexpensive package, has anyone thought of using them as backup media, as in a jukebox or autoloader? The access times and data transfer rate for data stored on them would make backing up databases, etc. MUCH more palatable (200+GB takes a LONG time to dump to tape for a full backup) Any thoughts on the matter?" Bet you've thought about this question before, haven't you? Has anyone done anything like this? If so, how well did it work?