I have setup a recurring job that backs up the system drive every week using fsarchiver and I am keeping at least 2 previous backups. I would strongly recommend using fsarchiver or dd before an upgrade. I have been using OMV since OMV 2.x on an ARM board like Raspbery Pi (oDroid XU4). I have went through every incremental upgrade since then. I can safely say that upgrades have went a lot smoother since OMV 5.
Thanks so much for your comment and for sharing your personal experience. Regarding FSArchiver, is it better than the OMV Backup plugin, or is it basically the same? My love-hate relationship with backup apps or commands is the restore process: how do I restore everything in case of a system crash?
I can have the backup files stored on a flash drive or in the cloud, but I’m not sure what the procedure is to restore OMV from those specific files in case of a system total crash?