plakar-s3-data: growth issue filed upstream as PlakarKorp/plakar#2338

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

ks4/plakar-s3-data.md

@@ -6,8 +6,9 @@ test passed (file tree + 10 GiB dumps snapshot), 04:30 nightly cron +
 Sunday `check -latest` installed. Replaces `incus-backup.sh` (its
 04:00 ks2 rsync cron is disabled). Open items: `seafile-fs` excluded
 (see §3 warning), `nextcloud-fs` costs 3–4 h/night (cost scales with
-tree size — upstream issue drafted, observing a few nights before
-filing).
+tree size, not churn — reported upstream 2026-08-25:
+[PlakarKorp/plakar#2338](https://github.com/PlakarKorp/plakar/issues/2338);
+giants to move to a restic leg meanwhile).
 
 Architecture: plakar runs **on ks4** (decision recorded in
 [plan.md](../ks2/plan.md)) and backs up **directly into an S3 kloset**