Zitat von "NeurOSick"
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Yes to clone the existing OS outside or in the server. Since it is not possible to make a backup of OMV parameters (such as FreeNAS for example, which saves its settings, perform a fresh install and then reapply all settings). I know it is not really possible with OMV since this is great opportunity there too possibility of setting and that's okay as well, otherwise it would say that would be limited;)
You can backup your config and import it back on a new install, it's just not mentioned anywhere. Just save your /etc/openmediavault/config.xml as config.bak on some other device and then save it on the new machine in the same path and restore it with the omv-firstaid command. Done.