I had to do a fresh OMV install and wanted to test my backup/restore protocols.
I followed this guide: [Backup Plugin] create a single img backup image for use with win32 disk imager / etcher, etc.
Basically I made a ddfull backup, flashed this using usbimager to a new formatted SD card (which was successful). Shutdown my OMV server, took out the existing SD Card, inserted new backup image SD card, started the system.
But I got an error saying error: invalid arch-independent ELF magic and then entering into rescue mode?