diff --git a/src/main/cljc/dda/c4k_jira/backup.cljc b/src/main/cljc/dda/c4k_jira/backup.cljc
index bebf960..91e6752 100644
--- a/src/main/cljc/dda/c4k_jira/backup.cljc
+++ b/src/main/cljc/dda/c4k_jira/backup.cljc
@@ -5,12 +5,12 @@
   [dda.c4k-common.yaml :as yaml]
   [dda.c4k-common.base64 :as b64]
   [dda.c4k-common.common :as cm]
-  [dda.c4k-common.prefixes :as pf]))
+  [dda.c4k-common.predicate :as pd]))
 
-(s/def ::aws-access-key-id pf/bash-env-string?)
-(s/def ::aws-secret-access-key pf/bash-env-string?)
-(s/def ::restic-password pf/bash-env-string?)
-(s/def ::restic-repository pf/bash-env-string?)
+(s/def ::aws-access-key-id pd/bash-env-string?)
+(s/def ::aws-secret-access-key pd/bash-env-string?)
+(s/def ::restic-password pd/bash-env-string?)
+(s/def ::restic-repository pd/bash-env-string?)
 
 #?(:cljs
    (defmethod yaml/load-resource :backup [resource-name]
diff --git a/src/main/cljc/dda/c4k_jira/core.cljc b/src/main/cljc/dda/c4k_jira/core.cljc
index 33ea69c..2758404 100644
--- a/src/main/cljc/dda/c4k_jira/core.cljc
+++ b/src/main/cljc/dda/c4k_jira/core.cljc
@@ -9,29 +9,31 @@
   [dda.c4k-jira.jira :as jira]
   [dda.c4k-jira.backup :as backup]))
 
+(def default-storage-class :local-path)
+
+(def default-jira-storage-size-gb 50)
+
 (def config-defaults {:issuer :staging})
 
-(def config? (s/keys :req-un [::jira/fqdn]
-                     :opt-un [::jira/issuer ::jira/jira-data-volume-path
-                              ::postgres/postgres-data-volume-path ::restic-repository]))
+(def config? (s/keys :req-un [::fqdn]
+                     :opt-un [::issuer ::restic-repository]))
 
 (def auth? (s/keys :req-un [::postgres/postgres-db-user ::postgres/postgres-db-password
                             ::aws-access-key-id ::aws-secret-access-key
                             ::restic-password]))
 
-(defn k8s-objects [config]
+(defn-spec k8s-objects any?
+  [config (s/merge config? auth?)]
   (into
    []
-   (concat [(yaml/to-string (postgres/generate-config :postgres-size :2gb :db-name "jira"))
-            (yaml/to-string (postgres/generate-secret config))]
-           (when (contains? config :postgres-data-volume-path)
-             [(yaml/to-string (postgres/generate-persistent-volume config))])
-           [(yaml/to-string (postgres/generate-pvc))
+   (concat [(yaml/to-string (postgres/generate-config {:postgres-size :2gb :db-name "jira"}))
+            (yaml/to-string (postgres/generate-secret config))
+            (yaml/to-string (postgres/generate-pvc {:pv-storage-size-gb 30
+                                                    :pvc-storage-class-name default-storage-class}))
             (yaml/to-string (postgres/generate-deployment :postgres-image "postgres:14"))
-            (yaml/to-string (postgres/generate-service))]
-           (when (contains? config :jira-data-volume-path)
-             [(yaml/to-string (jira/generate-persistent-volume config))])
-           [(yaml/to-string (jira/generate-pvc))
+            (yaml/to-string (postgres/generate-service))
+            (yaml/to-string (jira/generate-pvc {:pvc-storage-class-name default-storage-class
+                                                :pv-storage-size-gb default-jira-storage-size-gb}))
             (yaml/to-string (jira/generate-deployment config))
             (yaml/to-string (jira/generate-service))
             (yaml/to-string (jira/generate-certificate config))