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btrfs doesn't much RAM contrary to ZFS. The big difference is here that btrfs doesn't deduplicate every block that is written to it (don't know how that looks with tools like duperemove), but only files that are the same inside snapshots from the same subvolume. The biggest strengh for btrfs would be arguably the snapshot feature. You don't use so much space, you can keep a lot of snapshots for the same data, you can restore the whole snapshot or mount it and extract the files that you need and you can even send snapshots to another btrfs disk as a, backup. There are several tools that make use of the btrfs snapshot feature to backup data in a easy and consistent manner. My personal favorite is btrbk.