Restore from hassos raw data

Hi everyone,

my setup is a raspberry 4b, booting hassos 6.6 from an external SSD.
After a power outage, the system does not boot up anymore, but crashes briefly after the drive is detected.
Using another LINUX system, I still am able to mount hassos-overlay, hassos-data and hassos-kernel. Any chance I can recovered from a backup I made a few days ago which was copied locally?

Thanks, Tim