The ideal thing would be if you have multiple phones and can store one offsite at a friend's house. But that requires more complicated software and assumes peop

The ideal thing would be if you have multiple phones and can store one offsite at a friend's house. But that requires more complicated software and assumes people have multiple old Android phones laying around. I think more likely you'd pay a cloud service to handle backups for you. You just need to provide them with a read-only key then they can access the same way you do.