diff --git a/specifier-prompt.md b/specifier-prompt.md
index 30e2426..fe7fa94 100644
--- a/specifier-prompt.md
+++ b/specifier-prompt.md
@@ -325,6 +325,12 @@ that a single user-facing feature may require specs in more than one component.
     minimal-slp-wallet embedded bch-js) and `bchjs.Address.hash160ToCash()`
     (DB read side). Prefer bch-js over installing a separate cashaddr library.
     See `specs/feature-backlog.md` "Suggested next spec" for the follow feature.
+16. **ZMQ-mode DB backups (fixed 2026-08-28):** the block indexer only created
+    zip backups inside the IBD loop; the ZMQ live loop never called `backupDb()`.
+    Fix: a `BackupDb.maybeBackupDb` use case (`src/use-cases/backup-db.js`)
+    centralizes the `height % epoch === 0` decision and is called from both the
+    IBD and ZMQ paths in `psf-memo-block-indexer.js`. Spec:
+    `psf-memo-indexer/specs/zmq-mode-db-backups.feature`.
 
 ---
 
@@ -362,5 +368,5 @@ At the end of each session, update this file:
 - Note the current `master` HEAD commit.
 - State the next feature to work on.
 
-Current `master` HEAD: `f12e5b3` (topic list/discovery + topic feed merged to `master`; client build, unit 108, lint passing; DB unit 161, lint passing; indexer unit 46, lint passing).
+Current `master` HEAD: `883f014` (ZMQ-mode DB backups fix merged to `master`; indexer unit 54, property 4, acceptance 3 files, lint passing).
 Next action: **spec P2.3/P2.4/P2.5** — Topics (post a topic message / follow a topic / unfollow a topic).
diff --git a/specs/feature-backlog.md b/specs/feature-backlog.md
index 3c9a7ad..9849075 100644
--- a/specs/feature-backlog.md
+++ b/specs/feature-backlog.md
@@ -2,7 +2,7 @@
 
 **Status**: DRAFT — research refresh 2026-08-27.
 **Owner**: specifier.
-**Last updated**: 2026-08-27
+**Last updated**: 2026-08-28
 
 ---
 
@@ -240,3 +240,11 @@ closed.
 - Mutations/specs are Gherkin feature files under per-component `specs/` in
   the format defined by github.com/unclebob/Acceptance-Pipeline-Specification.
 - Root `specs/` contains this backlog and cross-component architecture notes.
+
+## Completed fixes (not roadmap features)
+
+- **ZMQ-mode DB backups** (2026-08-28, task `zmq-db-backups`): the block
+  indexer only created zip backups during IBD; the ZMQ live loop never called
+  `backupDb()`. Fixed by centralizing the `height % epoch === 0` decision in a
+  `BackupDb.maybeBackupDb` use case called from both the IBD and ZMQ paths.
+  Spec: `psf-memo-indexer/specs/zmq-mode-db-backups.feature`.