if you download strfry on your computer you can do:

strfry sync '--filter={"authors": ["32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245"]}' --dir=down wss://relay.damus.io

to make a backup of all of your notes, where 32e18... is your hex pubkey. it will only copy down the notes your local strfry relay doesn't have. negentropy set reconciliation ftw.

working on coding this up as a feature in notedeck/damus ios, so all your notes stay synced between your devices.