Scrub Your Btrfs Before It Scrubs You: Practical `btrfs scrub` + systemd timer

If you run Btrfs and never schedule btrfs scrub , you are skipping one of the filesystem's most useful maintenance tools. Scrub is not glamorous. It does not make your box faster. It will not clean up space. But it does walk your filesystem, verify checksums on data and metadata, and, when redundant copies exist, repair corrupted blocks from a good copy. That is exactly the sort of quiet maintenance you want happening before a bad block turns into a bad day. This guide covers: what btrfs scrub a