diff --git a/agent/BACKLOG.md b/agent/BACKLOG.md
index 55de533..3855cef 100644
--- a/agent/BACKLOG.md
+++ b/agent/BACKLOG.md
@@ -86,13 +86,6 @@ untracked canonical state file is still detected.
 
 ## NEXT
 
-### 102. Nextcloud Desktop opt-in through Home Manager
-
-Expose and document upstream Home Manager `services.nextcloud-client` in the
-downstream template, including its background-session lifecycle; do not add a
-duplicate Nomarchy wrapper. Pass = the documented opt-in installs the client,
-starts it with the graphical session, and disabling it removes that lifecycle.
-
 ### 103. Live ISO baseline desktop applications
 
 Make Chromium and Firefox, `libreoffice-fresh`, GNOME Text Editor, Amberol, and
diff --git a/agent/JOURNAL.md b/agent/JOURNAL.md
index 228c5f0..e1ac31c 100644
--- a/agent/JOURNAL.md
+++ b/agent/JOURNAL.md
@@ -19,6 +19,21 @@ Template:
 
 ---
 
+## 2026-07-13 — #102 Nextcloud Desktop opt-in in the template (this commit)
+- **Task:** BACKLOG #102 — document upstream HM `services.nextcloud-client`
+  as a downstream-template opt-in; no Nomarchy wrapper.
+- **Did:** Commented `services.nextcloud-client` block in
+  `templates/downstream/home.nix` (enable + startInBackground), and pointed
+  the bare `# nextcloud-client` package line at it (service = app + session
+  lifecycle; re-comment removes both).
+- **Verified:** V1 — pinned HM 26.05 module confirmed
+  (enable/package/startInBackground); eval test on an uncommented template
+  copy via `lib.mkFlake`: unit ExecStart `nextcloud --background`,
+  WantedBy/PartOf `graphical-session.target`. `nix flake check --no-build`
+  green (includes template-sot + downstream-template-home).
+- **Pending:** nothing — runtime lifecycle is the upstream module's contract.
+- **Next suggestion:** #93/#99/#107 land next (shared live-VM evidence run).
+
 ## 2026-07-13 — User-promoted NEXT queue curation (#102–#112; this commit)
 - **Task:** Audit Bernardo's live-ISO, application, menu, and device follow-ups
   against shipped behavior and curate the executable queue.
diff --git a/docs/ROADMAP.md b/docs/ROADMAP.md
index f560efb..0170cad 100644
--- a/docs/ROADMAP.md
+++ b/docs/ROADMAP.md
@@ -811,8 +811,9 @@ Design/decision records and a running log of shipped work (items marked
   Avahi mDNS), `openrgb` (RGB lighting daemon), and `restic` (scheduled
   daily backup — a small option surface: `repository`/`passwordFile`/`paths`,
   7/4/6 retention). More candidates by area:
-  - ✓ **cloud/sync:** Syncthing (`services.syncthing`); Nextcloud client is a
-    bare tray app (in the app-suite menu, not a service)
+  - ✓ **cloud/sync:** Syncthing (`services.syncthing`); Nextcloud client is
+    an upstream-HM opt-in (`services.nextcloud-client`, commented in the
+    template — installs the app + starts it with the session; #102)
   - ✓ **local AI:** Ollama (`nomarchy.services.ollama`, optional GPU accel)
     ships; LM Studio is a (commented) app-suite package (a bare GUI, no
     service) — pairs with the menu's Ask-Claude philosophy
diff --git a/templates/downstream/home.nix b/templates/downstream/home.nix
index 3951655..5b3bc8d 100644
--- a/templates/downstream/home.nix
+++ b/templates/downstream/home.nix
@@ -76,6 +76,12 @@
   # nomarchy.keyboard.layouts = [ "de" "fr" ]; # optional: put these first in the
   #                                            # new-keyboard picker (all installed XKB
   #                                            # layouts are searchable without this)
+  #
+  # services.nextcloud-client = {      # Nextcloud sync client (upstream Home Manager
+  #   enable = true;                   #   module — installs the client and starts it
+  #   startInBackground = true;        #   with the graphical session; tray icon only,
+  # };                                 #   no window). Re-comment to remove the app
+  #                                    #   AND its background service.
 
   # ── Application suite ───────────────────────────────────────────────
   # A starter complete-workstation set, installed for your user — yours to
@@ -170,7 +176,8 @@
     # mangohud                    # in-game overlay
 
     # Files, sync & torrents
-    # nextcloud-client
+    # nextcloud-client            # bare app — services.nextcloud-client above
+    #                             # also autostarts it with the session
     # localsend                   # AirDrop-like transfer
     # qbittorrent