Add a BTRFS snapshots guide and mention it as an advanced install option
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@@ -97,6 +97,10 @@ Finish with *Finish partitioning and write changes to disk*, then confirm with *
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✨ __Tip:__ what actually lives on that one partition, and why `/srv/docker` is where this guide puts every stack, is covered in **folders and partitions**.
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::tip{icon="" to="/serveex/advanced/btrfs-snapshots"}
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✨ __For advanced users:__ picking *Manual* here instead of *Guided* lets you format the root partition as Btrfs instead of ext4, unlocking instant, near-free snapshots you can roll back to before a risky update or config change. It's not a replacement for real backups, a snapshot lives on the same disk, see **BTRFS snapshots** if you want to set it up.
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#### Mirror and surveys
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Answer *No* to *Scan another installation medium?*, everything else comes from the network. For the mirror, pick any one in your country, or `deb.debian.org` which routes to a nearby one automatically, and leave the HTTP proxy field empty unless you actually have one. The popularity contest (anonymous package statistics) is yes or no, no consequence either way.
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