So far myself I have been lucky in that a very few number of our databases have a restore commitment of less than 24 hours and those that are are less than 100MB each and replicated to another location. I have however had the loving experience of within a month of each other both the primary and backup sites lost a drive in a RAID5 array. Fortunately this was one drive and we got replaced before lossing any more (we did have to wait a week on 1 drive and boy was everyone sweating it).

"Don't roll your eyes at me. I will tape them in place." (Teacher on Boston Public)