001: Back up early, back up often.
Contrary to popular belief, film is not dead. At this point, I'm thinking it might outlive videotape. Even though I like to shoot on film, my footage gets turned into computer data soon after the negative is developed. In the past, this meant dealing with videotape. But we've gone tapeless for Interplanetary, and it's great. Instead of dealing with high-end hardware, expensive videotape cassettes, and long tape-to-computer transfer times, I just plug up a disk drive to my editing machine and copy files.
Tape does have a reliability advantage -- unlike a hard disk, a videocassette won't crash. But USB and FireWire disk drives are so inexpensive these days, why not just back up everything twice? It's kind of like a poor man's RAID.
For Interplanetary, I purchased two USB LaCie drives from OnSale.com. I paid less than $120 for each 500 GB drive. Assuming we don't go too crazy with our shooting, I should be able to back up all the raw video files for the flick twice -- once on each drive.
I hear that hard disks are more likely to die if they sit unused for long periods of time. Even if you have redundant backup drives, it's probably a good idea to spin 'em up every month or two.