nixos-mailserver/docs/backup-guide.rst

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Backup Guide
============
First off you should have a backup of your ``configuration.nix`` file
where you have the server config (but that is already in a git
repository right?)
Next you need to backup ``/var/vmail`` or whatever you have specified
for the option ``mailDirectory``. This is where all the mails reside.
Good options are a cron job with ``rsync`` or ``scp``. But really
anything works, as it is simply a folder with plenty of files in it. If
your backup solution does not preserve the owner of the files dont
forget to ``chown`` them to ``virtualMail:virtualMail`` if you copy them
back (or whatever you specified as ``vmailUserName``, and
``vmailGoupName``).
Finally you can (optionally) make a backup of ``/var/dkim`` (or whatever
you specified as ``dkimKeyDirectory``). If you should lose those dont
worry, new ones will be created on the fly. But you will need to repeat
step ``B)5`` and correct all the ``dkim`` keys.