Here some guide

You have some channels open with local-balance committed. Without SCB you run a risk of losing these funds in case of a hard-drive failure. Well, then how does SCB protect against this loss of funds?

Enabling SCB automatically backs up your channel data whenever new channels are opened or old ones are closed. This is done by backing up the data into a file named channel.backup . Now, this file resides within the same machine which is not at all ideal, but we will address this later. Given that you have a channel.backup file and your seed, in case of data loss, you will restore the wallet using your seed, next you will use the CLI command restorechanbackup and pass the path to your channels.backup file. This should be enough to recover your on-chain and also the local funds committed into channels.

The channel backup file is encrypted using a key derived from your wallet seed.