good documentation is here: https://docs.checkmk.com/latest/en/omd_basics.html#omd_backup_restore

- you don't have to stop the site to backup, the rrd data will be cached

- just use command: "omd backup <sitename> your-backupfile.tar.gz

- you can backup directly over network to the new system:
.. omd backup <sitename> - | ssh username@new-system "cat >/tmp/sitename-backup.tar.gz"
.. once the backup is finised use "omd restore /tmp/sitename-backup.tar.gz" on the new system

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