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    • Modified files in /etc are now migrated to new OS versions based on a whitelist
    • Additional whitelist entries can be added via config fragments
    • Up to five previous snaphots of /etc modifications will additionally be retained in /var/lib/steamos-atomupd/etc_backup/

    Now, this is an interesting feature! Reminds me a bit of NixOS inspired.

    • Look like fedora atomic, but all /etc is preserved without the need for whitelisting