you're welcome. yeah, it's not really a channel backup. that's confusing, huh? it's more of a funds recovery in case of disaster. a way to get your funds out of Lightning and back on-chain.

you CAN migrate all of your channels from one node device to another. i just did all of this actually a couple weeks ago. i migrated from umbrel to another device. you need to go in via command line and backup your LND directory, mainly your channels.db and wallet.db files.