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1) If I only backup that extended private masterkey, would I be able to recreate the wallet entirely in case my application crashes? Or do I really need to backup the wallet file itself? (Let's say I do not import addresses that were not generated by bitcoind itself.) No. Bitcoin Core does not allow your to create a wallet from the master private key. There ...


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As pointed out in similar questions backups are tricky with lightning. In the case of lightning each payment channel is a 2 of 2 multisig wallet. One of the keys is in your possession and it differs for each channel but in generally is derived from your master key. The masterkey in c Lightning is 32 byte and stored in binary in ./lightning/hsm_secret ...


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The process writing the file is bitcoind, not bitcoin-cli, which is simply issuing RPC commands to the server.bitcoind needs to be able to write to the destination, which can’t be another users home folders unless you explicitly give it permission.


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