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this post was submitted on 23 Mar 2026
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I wanted btrfs for ages for snapshots.. Then I moved to nixos with Declarative config... Then I needed to move partitions to extend my drive into old root, decided to move to btrfs from ext4 cos why not at the time... Only afterwards do I realize snapshots aren't that helpful when you're on nixos.. Or am I missing something?
They are still useful for user data. For the nixos system itself, not so much.
Ok fair.. Maybe I don't care about user data so much it seems.. Only config :p
Transparent fileystem compression and deduplication (btrfs feature not in ext4) compresses data while still having it be accessible normally. This leads to big space savings.
You can use the tool
compsizeto check it out.Thanks. Will do.