diff --git a/filebrowser/deployment.yaml b/filebrowser/deployment.yaml
index 9548e84..3226d89 100644
--- a/filebrowser/deployment.yaml
+++ b/filebrowser/deployment.yaml
@@ -8,6 +8,9 @@ metadata:
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
+  annotations:
+    # Never let ArgoCD prune this PVC: it holds persistent app data.
+    argocd.argoproj.io/sync-options: Prune=false
   name: filebrowser-db
   namespace: filebrowser
 spec:
diff --git a/ghost-en/deployment.yaml b/ghost-en/deployment.yaml
index d72743d..110dc17 100644
--- a/ghost-en/deployment.yaml
+++ b/ghost-en/deployment.yaml
@@ -8,6 +8,9 @@ metadata:
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
+  annotations:
+    # Never let ArgoCD prune this PVC: it holds persistent app data.
+    argocd.argoproj.io/sync-options: Prune=false
   name: ghost-en-content
   namespace: ghost-en
 spec:
diff --git a/openclaw/pvc-openclaw.yaml b/openclaw/pvc-openclaw.yaml
index 3c48e21..39f834f 100644
--- a/openclaw/pvc-openclaw.yaml
+++ b/openclaw/pvc-openclaw.yaml
@@ -1,6 +1,9 @@
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
+  annotations:
+    # Never let ArgoCD prune this PVC: it holds persistent app data.
+    argocd.argoproj.io/sync-options: Prune=false
   name: openclaw-pvc
   namespace: openclaw
 spec:
diff --git a/registry-cache/pvc-registry-cache.yaml b/registry-cache/pvc-registry-cache.yaml
index 6a6228b..aee463b 100644
--- a/registry-cache/pvc-registry-cache.yaml
+++ b/registry-cache/pvc-registry-cache.yaml
@@ -1,6 +1,9 @@
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
+  annotations:
+    # Never let ArgoCD prune this PVC: it holds persistent app data.
+    argocd.argoproj.io/sync-options: Prune=false
   name: registry-cache-pvc
   namespace: registry-cache
 spec:
diff --git a/researchowl/deployment.yaml b/researchowl/deployment.yaml
index 3b951d8..529ee5f 100644
--- a/researchowl/deployment.yaml
+++ b/researchowl/deployment.yaml
@@ -8,6 +8,9 @@ metadata:
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
+  annotations:
+    # Never let ArgoCD prune this PVC: it holds persistent app data.
+    argocd.argoproj.io/sync-options: Prune=false
   name: researchowl-data
   namespace: researchowl
 spec:
diff --git a/trilium/pvc.yaml b/trilium/pvc.yaml
index f568722..ab94a7c 100644
--- a/trilium/pvc.yaml
+++ b/trilium/pvc.yaml
@@ -1,6 +1,9 @@
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
+  annotations:
+    # Never let ArgoCD prune this PVC: it holds persistent app data.
+    argocd.argoproj.io/sync-options: Prune=false
   name: trilium-pvc
   namespace: trilium
 spec:
diff --git a/umami/deployment.yaml b/umami/deployment.yaml
index 831929f..dade2bd 100644
--- a/umami/deployment.yaml
+++ b/umami/deployment.yaml
@@ -8,6 +8,9 @@ metadata:
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
+  annotations:
+    # Never let ArgoCD prune this PVC: it holds persistent app data.
+    argocd.argoproj.io/sync-options: Prune=false
   name: umami-postgres-data
   namespace: umami
 spec:
diff --git a/zona-exclusion/deployment.yaml b/zona-exclusion/deployment.yaml
index c232458..f2b8b3c 100644
--- a/zona-exclusion/deployment.yaml
+++ b/zona-exclusion/deployment.yaml
@@ -8,6 +8,9 @@ metadata:
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
+  annotations:
+    # Never let ArgoCD prune this PVC: it holds persistent app data.
+    argocd.argoproj.io/sync-options: Prune=false
   name: zona-exclusion-data
   namespace: zona-exclusion
 spec: