Create backup.nix

system/helpers/backup.nix

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+  ### Backups
+  # Set this to enable nix-bitcoin's own backup service. By default, it
+  # uses duplicity to incrementally back up all important files in /var/lib to
+  # /var/lib/localBackups once a day.
+  { services.backups.enable = true; }
+  #
+  # You can pull the localBackups folder with
+  # `scp -r bitcoin-node:/var/lib/localBackups /my-backup-path/`
+  # Alternatively, you can also set a remote target url, for example
+  # services.backups.destination = "sftp://user@host[:port]/[relative|/absolute]_path";
+  # Supply the sftp password by appending the FTP_PASSWORD environment variable
+  # to secrets/backup-encryption-env like so
+  # `echo "FTP_PASSWORD=<password>" >> secrets/backup-encryption-env`
+  # You many also need to set a ssh host and publickey with
+  # programs.ssh.knownHosts."host" = {
+  #   hostNames = [ "host" ];
+  #   publicKey = "<ssh public from `ssh-keyscan`>";
+  # };
+  # If you also want to backup bulk data like the Bitcoin & Liquid blockchains
+  # and electrs data directory, enable
+  # services.backups.with-bulk-data = true;