If you want that sort of guarantee, it's a bad idea to use a free service without an obvious alternative business model (it's probably reasonable to use Gmail,

If you want that sort of guarantee, it's a bad idea to use a free service without an obvious alternative business model (it's probably reasonable to use Gmail, even though you don't pay for it directly). I haven't used the app, but it's likely that they're stored to your Camera Roll anyways, as Instagram does? In that case, they'd be backed up with the rest of your iPhone.