Finally got my laptop back from the repair shop.
As my old system was a bit of a grown mess from multiple computer and disk switches before, I decided to set up a new Arch Linux system from scratch via https://discovery.endeavouros.com/encrypted-installation/btrfsonluks-quick-copy-paste-version/2021/03/.
I couldn't be happier with the result! BTRFS Snapshots take mere seconds, and with grub-btrfs, you can boot right into a snapshot in case something goes wrong. And Timeshift has native snapshot support as well. \o/
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