Because of this, I've come to distrust any offering that's not self-hosted on my homeserver. Sounds drastic, but I've been burned too often. The quality I get from this is significantly lower, the amount of work I need to put in is much more, and though often fun it's not always at convenient times and sometimes I hate it. But I'm fairly confident that all my data, be it email, cal, notes, pictures, whatnot, will still be accessible 3 years or 10 years from now. Some things from 10 years ago I dearly miss, and I don't want that to happen again.