I backed up my former system with Clonezilla and found restoring in Virtualbox (with the ‘guest additions’ installed) to be the most convenient way to recover some files. Both computers are amd64, but the other was using AMD hardware (I installed Vulkan drivers from the Fedora repo at some point) while the current has an Intel CPU. I booted/installed the Clonezilla ISO as fedora-x64 and removed the disk image from the VB’s storage devices after the restoration.
The recovery process seemingly finished without errors, but when booting the virtual system I receive this message:
FATAL: Could not read from the boot medium! System halted.
I can boot in EFI, but I assume that my access there is limited, especially as a novice user.
Additionally, I haven’t quite understood if a virtual machine is able to boot without any storage device (to make myself clear, I installed the Clonezilla backup into this machine and don’t need any boot media anymore):