We had one nostr London episode just about relays, you can play on your mobile and setup a local relay to backup everything using app nostr:nprofile1qqsts0n0s20fk0s087ydcd7zj20ajv2t90m680zr6f0x5gp6w0p8wkqpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtcnalxn2. There are some tutorials on youtube about the relays. #citrine