By the way and very besides: Maybe I know a way, which might solve the issue.
If creating an ISO with bootcdwrite, then this can be cpied to an USB-stick, which then can be booted from, and after it you can restore the drives. This ISO can be created during runtime. Yeah, not the best solution, but better than none. I am using this for my KALI-computers. The only thing, which does not work, is using encrypted drives. You can create the ISO, but restore does not work (at least, I found no way for this). Please allow me, to close this thread hereby. Thank you all for your help. Best regards Hans
