I need to move my already running umbrel server on Ubuntu/Linux to a Pi4 keeping open channles and BTC wallet funds.
Which is the best way to keep existing configuration? Is there a way to backup and restore BTC and LN config? Which files may I copy to fit this?
A safe way would be to close down your channels. Then build a new Raspi using your mnemonic which will recover all your on-chain funds. As I understand moving over channels is hard.
It may be possible to move your node over to new hardware by copying your .lnd folder. Definitely try at your own risk though, you can lose funds if you have both new and old node running.
Reddit - Migrating LND Node to Another Device