Keys

Your Lightning node or wallet will have keys. Look at Backup for instructions.

Bitcoin key (on-chain)

A wallet and lightning node usually hold bitcoins to open channels. If you backup this key you can get your on-chain balance back.

Commitment revocation private key

Every commitment transaction has a unique commitment revocation private-key value that allows the other peer to spend all outputs immediately: revealing this key is how old commitment transactions are revoked. To support revocation, each output of the commitment transaction refers to the commitment revocation public key.