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Undo bake-off: copy the folder wins (09 §3 decisions 19-20, §6.1a)
- 09 §3: decision 19 (the copy method is chosen by a bake-off) and 20 (the
  full-system backup waits for the update leg, inside its window; built later).
- Bake-off on 9202, docmost / romm / vikunja: both methods pass every case;
  the folder copy wins because an app with no database server gets no dump,
  so dump-and-load would need the folder copy anyway. 1-5 s extra downtime,
  ~420 MB/s, disk = the volumes.
- R-645 filed: lifting an update hold by hand lets the recovery unit be
  re-captured with the failed definition within seconds.

Documents and evidence only; product code follows in the controller.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS
2026-09-23 10:28:56 +02:00

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10:04:32 === cut-off copy: docmost (largest volume docmost_docmost_postgres_data)
10:04:39 copy rc=137 (137 = killed)
source bytes=69334709 cut copy bytes=69334709
finished-marker in the cut copy: 1 -> F refuses to swap
D: whole copy marker: 1 cut copy marker: 0 -> D refuses to load
10:04:55 NOTE: the attempt above killed the docker CLIENT (rc 137) while the copy CONTAINER ran on and finished — so nothing was cut and the marker was written. Redo: kill the copy CONTAINER itself mid-copy.
10:05:07 kill after 0.15s: container exit=0 source bytes=69172397 cut copy bytes=69172397 finished-marker=1
kill after 0.25s: container exit=0 source bytes=69172397 cut copy bytes=69172397 finished-marker=1
kill after 0.35s: container exit=0 source bytes=69172397 cut copy bytes=69172397 finished-marker=1
10:05:31 kill after 0s: container exit=137 source bytes=69172397 cut copy bytes=42921516 finished-marker=0
kill after 0.02s: container exit=137 source bytes=69172397 cut copy bytes=48586287 finished-marker=0
kill after 0.05s: container exit=137 source bytes=69172397 cut copy bytes=59159114 finished-marker=0
kill after 0.08s: container exit=137 source bytes=69172397 cut copy bytes=68445276 finished-marker=0