I have found that I need this command to make a full backup of the Etc folder
tar cJPf /srv/dev-disk-by-label-Share/Myfiles/$(date +%F)-$(hostname)-etc-tar.xz /etc/
But what command do I need to restore this backup to a new installation?
And what about preserve symlinks? -When I can see it important when you take a backup of letsencrypt under the folder etc