Also called reflink on Linux. Which are supported by bcachefs, Btrfs, CIFS, NFS 4.2, OCFS2, overlayfs, XFS, and OpenZFS.
Sources: https://unix.stackexchange.com/questions/631237/in-linux-whi... https://forums.veeam.com/veeam-backup-replication-f2/openzfs...