I know that this topic has been discussed many times. I am referring to cloning a larger disk into a smaller SSD. I know, of course, that first - for example, using gparted - I have to narrow the partitions so that their total size is slightly smaller than the target disk. Then I want to use Clonezilla to clone the disk. But I have WIN10 and Mageia 6 (Grub2) installed on the disk. If I use Clonezilla after using it, I will be able to choose the boot from one or the other system at once, or I will have to do something else. What are Colleagues experience in this area? Does WIN start after this cloning correctly?

Clonezilla makes a bit for bit copy of the disk, so the new disk should boot exactly the same as the old one.

Edit: I assume the old and new drive are both SATA. You may have a problem if you are going from a SATA drive to an NVMe SSD drive, because Grub won't be configured to boot from the correct device.

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Hope You are right. First of course "ordinary" disk image using dd, because only real tough people live without backup ;-)