And keep in mind that "Raspberry Pi fails" is a more common scenario than "provider goes out of business", so from the perspective of minimizing the scramble, that's the one I'd be more concerned about.
A bit more about backups: for something truly important, you should have an offline copy, in case a malicious party compromises credentials that can be used to overwrite both the primary and the backup. I don't think you should depend on the vendor backing up your data. Some things you just have to do yourself, unfortunately.