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How it works
GRUB works well with Snapper for root folder (plus grub-btrfs); however, you need to replace original root with manually created first snapshot.
Also, you need to modify GRUB options a bit.
Snapper will over-snapshot to include temporary folders as well. This can be fixed with mounting. Also, you wouldn't want virtualized drives in your snapshot.
I would also set virtualized drives and caches as nodatacow.
snapper -c home create-config works in this case as well; however, you can't really rollback.
Also, Snapper will over-snapshot to include less important hidden folders, temporary folder, and large folders. This can be fixed with mounting or symbolic links.
Be prepared to learn more both BTRFS as well, if you want to use this option.
GRUB does work well, but rEFInd is not only more beautiful, but also auto-detect Windows and bootable removable drives. However, I don't find refind-btrfs satisfactory, so I use both GRUB and rEFInd.