And, for example, if you lose onchain wallet data and it's backups, you will never be able to spend that onchain bitcoin.
No, you only need the seed and derivation path that is part of the protocol, the lightning state is not.
seed and derivation path
That's what I mean with "backups".
part of the protocol
Part of which protocol? It's bunch of BIPs, Bitcoin Core doesn't implement most of them, for example.
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