Backup before bazzite install. Is it valid?

is it enough of a backup of my windows install to do sudo dd if=/dev/nvme0n1 bs=1M conv=noerror,sync | gzip > thinkpad.img.gz before i try bazzite? i did it from a linux livecd.

and then i checked the extracted img with fdisk -l thinkpad.img and it says The backup GPT table is not on the end of the device.

but when i actually mount it read only i can see my files ok
sudo kpartx -a -v thinkpad.img
sudo mount /dev/mapper/loop1p3 /mnt/thinkpadssd -o ro

If things dont work out i intend to take this img.gz, extract it, and then from livecd do dd if=thinkpad.img of=/dev/nvme0n1 Will I still be able to do this with the error about the backup GPT table?
Solution
we would recommend clonezilla for a backup, also if the backup of windows with bitlocker enabled it might be invalid when restoring it
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