Umbrel Nostr Relay App Now Syncs Your Private Relay with Public Relays

"Now you can sync your private relay on Umbrel with public relays, and back up past and future Nostr activity, even if the connection between your client and your private relay goes down."

https://www.nobsbitcoin.com/umbrel-nostr-relay-app-now-syncs-your-private-relay-with-public-relays/