We might need to normalize having Nostr clients support export and import backup functionality — saving to local disk, iCloud, Google Drive, or wherever. Not everyone will run their own personal relay so this might be a good alternative.
Discussion
yeah cloud backup is a cool idea
Won't that take us back to centralized authority or is that a risk we are willing to take in the name of storage space?
Not really. As long as you have the option to backup to your own non-custodial storage and/or to one or many storage providers, that mitigates the risk.