diff --git a/lib/backup-stack.ts b/lib/backup-stack.ts
index c9a980c..07aaad0 100644
--- a/lib/backup-stack.ts
+++ b/lib/backup-stack.ts
@@ -253,13 +253,14 @@ export class BackupStack extends cdk.Stack {
     // the locked offsite vault ("offsite for everything"). Same role and rule
     // as phase-1; a separate selection keeps the phase-1 critical set readable.
     //
-    // Still EXPLICIT-ARN (not tag-based) on purpose: the file-share volumes are
-    // standalone CDK-managed (RETAIN) and the DynamoDB tables are owned by other
-    // stacks, so tagging them here would drift those stacks — the same reason
-    // phase-1 avoided tags. Tradeoff: if a volume is replaced (new vol-id) it
-    // silently drops from this selection; scheduled drift detection + the audit
-    // re-run are the backstop. Identifiers verified against the live account
-    // 2026-06-03.
+    // Still EXPLICIT-ARN (not tag-based) on purpose: the DynamoDB tables are
+    // owned by other stacks, so tagging them here would drift those stacks.
+    // File-share left this account on 2026-09-29 (PLAT-77). Both of its volume
+    // ARNs are out of this selection so a later delete of the retained volume
+    // does not fail the backup job. Tradeoff: if a volume is replaced (new
+    // vol-id) it silently drops from this selection; scheduled drift detection
+    // and the audit re-run are the backstop. Identifiers verified against the
+    // live account 2026-06-03.
     //
     // Excluded by intent: the ledgerflow tables — the whole LedgerFlow stack
     // was decommissioned 2026-06-03 (audit Day 4), so they no longer exist.
@@ -290,9 +291,7 @@ export class BackupStack extends cdk.Stack {
         // the vault CMK, as the C-7 database-1 smoke-test confirmed)
         ...[
           "vol-05cb0eb5c145d799b", // SeaHavenIndustries-dev
-          "vol-054cf918f227d88f6", // file-share (20 GiB)
           "vol-00f05a5a809697ce5", // forgejo
-          "vol-04d951cccacc435b5", // file-share NAS (500 GiB)
           "vol-07094902194638fff", // syslog-server
           "vol-0c2cbe9e71517a517", // Mutual Aid Data
           "vol-0fe224f13812f47e7", // jump box