> Don't touch your existing M.2 drive.  Get a spare drive (spinning rust
> is OK) at least as large as your M.2 drive and that you can attach to
> your machine (e.g. with a USB SATA dock).
> 
> Download Tails to a USB stick.  Boot your machine into Tails.  Connect
> your spare drive.  `fdisk -l` to be sure you have the right device names
> for all your disks.  `dd` your M.2 to the spare drive.  Now `sync` the
> disk and detach it.  You now have a backup of your current state.
> 
> If you _need_ to access some VM data now, you can (with major negative
> security implications) decrypt your M.2 disk manually with `cryptsetup`,
> navigate to <m.2>/var/lib/qubes/appvms/<yourvm> and use `losetup` to
> help mount the VM's data disk in Tails so you can copy off whatever data
> you urgently need.


Thanks! It must be at the qubes FAQ. Next time it will help. I got the idea 
with cloning drive (vs actual remove it and do something with it). And looks 
like it's not so hard to decrypt the whole drive and mount some qubes data 
disks. Hope I will run without troubles, but will know this opportunity for 
future use. 

Chris, thanks! Now solved. I'm at EFI. It was not possible to select something 
on the boot time or I don't know how to do this.

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