My quest for a backup brain is (almost) at an end. Evernote flat out rocks. It runs as a great Mac app (on that other OS too, in case through some disaster I ever need it). It has a nice web interface, including a web clipper. It’s on the iPhone. Anything I put in there is immediately at my fingertips.
It only needs one more thing, one of several actually: ability to sync notes to the filesystem OR an API (which is reportedly on the way). Even a way to backup all notes would be a good start.
Check it out. -m