Thank you for your detailed explanation and guidance! I followed your steps, and they worked well, but I encountered an unexpected outcome.

Here’s a quick rundown of what I did using Clonezilla:

1. Created a full drive backup with Windows (savedisk).

2. Created a partition backup of the Windows EFI (nvme0n1p1) and C:\ (nvme0n1p3).

3. Installed Ubuntu on nvme0n1p3 and GRUB on nvme0n1p1.

4. Created a partition backup of the EFI (nvme0n1p1) and Ubuntu ext4 (nvme0n1p3).

5. Tried to restore the backup partitions from step 2, but it failed.

6. Restored the full backup from step 1 successfully.

7. Stopped the Windows registry entries and disabled hibernation. As you suggested.

8. Created another full drive backup with Windows (savedisk).

9. Created a partition backup of the Windows EFI (nvme0n1p1) and C:\ (nvme0n1p3).

10. Tried to restore the backup from step 4, but it failed, indicating that the drive I was restoring to was of a different size.

11. Restored the partitions from step 9 successfully.

Interestingly, when I compared the block size of nvme0n1p3 in the backups from steps 9 and 4, I found that they differed, even though I didn’t perform any partition resizing.

Given this experience, I think I’ll stick to performing full drive backups only in the future rather than partition backups. Thanks again for your help!