> If one has a backup scheme where files are stored in a content-adressable store, I can see the efficiency. But I have never heard of such a scheme in the cont

> If one has a backup scheme where files are stored in a content-adressable store, I can see the efficiency. But I have never heard of such a scheme in the context of backups. One example of a system which does that is borgbackup. But even a simple "rsync with snapshots" benefits from identical files, since with common rsync options identical files are not transferred again (which means the data is kept shared between the snapshots).