This afternoon, I did a massive cleanup of TiVo. Went from 80% full to 50% full. There were multiple episodes of programs I didn't even ever remember wanting to see.
There are still a lot of non-transferable movies on the harddrive that I'm just going to have to eat if the thing dies. But, I feel better about it all since I've gone through it with a fine toothed and thoughtful comb.