Assuming you're on a filesystem that supports reflinks (Btrfs, XFS), `--clone` is an interesting option as well. Though assuming you create a volume backup befo

Assuming you're on a filesystem that supports reflinks (Btrfs, XFS), `--clone` is an interesting option as well. Though assuming you create a volume backup before starting migration, hardlinks don't really have downsides and will probably have better performance after the upgrade since the avoid copy-on-write.