The machine already had snapper running hourly on btrfs, so the tool was
never missing. What was missing is that snapper's only configuration
covered / -- and /home is a separate subvolume with no configuration at
all. Six hundred and forty-three snapshots existed and not one of them
contained a document. Anyone reaching for file history would have found
their system and none of their files.
/home now has a configuration on the same hourly timeline, with
deliberately conservative retention: Steam's 1.2 TB lives on that
subvolume and churns on every game update, so keeping five hourly and
seven daily bounds what those updates can pin.
Per volume, because on this machine "one is covered and the important
one is not" was the news, and a timeline opening on system snapshots
would have buried it. Inside a volume the timeline is the familiar view:
points in time, newest first, each openable as a folder tree to take a
file out of.
Restoring sets the current version aside as .before-restore-N rather
than overwriting it. A restore that destroys the thing you were about to
compare against is how someone loses the work they were trying to save.
Rollback is deliberately absent. snapper's rollback changes the btrfs
default subvolume, and this system's fstab pins subvol= explicitly,
which overrides it -- so a rollback would report success and change
nothing after a reboot. A recovery feature that silently does nothing is
worse than not having one, and making it work means editing fstab and
the bootloader, whose failure cannot be repaired from inside the
desktop.
Per-snapshot size is reported as not measured, because measuring it
needs btrfs quotas that cost performance on every write. Free space is
shown instead, which is the number that decides anything.
Claude-Session: https://claude.ai/code/session_01BRvzt4H8XXLPVH5MyYdk9L
Gabriel Brown
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