Automatic comment backup?

[pryds]

Recently I had a harddisk crash, resulting in having to re-install OS and Armory and restore my wallet from paper backup. Unfortunately I didn't backup comments, so now I'm stuck with all transactions having no comments.

This made me think, why not automatically backup transaction comment strings every time there is a change to a user-specified location (e.g. dropbox folder, whatever), of course encrypted by the private key/armory backup key/whatever makes sense. This way, it should be possible to also recover comment strings after recovering from a paper backup.