[forgotmypw3]

I think what you can do now is avoid complex, binary, and/or proprietary formats for your data, because they are more difficult to back up and restore.

You can also learn to not trust software which promiess you the world, but doesn't let you see its internals.

[jquery]

Yeah, lesson learned. Fortunately my most critical data was backed up elsewhere. This seems like an inherent issue with iOS, I will consider migrating to a different platform. Any suggestions other than Android?

[forgotmypw3]

See which iOS apps can export/import plaintext or other common formats, especially in an automated way.