There was a checklist program I used on my Centro that I really liked, Checklist Lite or something like that... it's "backup" was basically dumping the list to a memo, and it would also import from a memo.

It was nice in that regard, I could type up a memo on my Palm Desktop, like my grocery shopping checklist... import that, edit it as things changed in the memo and just import again to easily keep my checklist up to date.

So something along those lines... import/exporting to a simple text file might be a nice and easy way to accomplish backing up. Use an outline format to designate folders vs tasks (and subfolders if you decide to go that far).

if it just exported to a text file like that, I could then upload it to box.net or dropbox or whatever my preferred cloud storage is.