diff --git a/modules/blocks/postgresql.nix b/modules/blocks/postgresql.nix
index 4bb1ea5..7472255 100644
--- a/modules/blocks/postgresql.nix
+++ b/modules/blocks/postgresql.nix
@@ -55,6 +55,7 @@ in
         Backup configuration.
       '';
 
+      default = {};
       type = lib.types.submodule {
         options = contracts.databasebackup.mkRequester {
           user = "postgres";
@@ -169,10 +170,5 @@ in
             (upgrade-script 15 16)
           ];
         }
-        {
-          # Seems superfluous but otherwise we get:
-          # The option `shb.postgresql.databasebackup' was accessed but has no value defined.
-          shb.postgresql.databasebackup = {};
-        }
       ]);
 }
diff --git a/modules/services/forgejo.nix b/modules/services/forgejo.nix
index 3d5b1cb..7399132 100644
--- a/modules/services/forgejo.nix
+++ b/modules/services/forgejo.nix
@@ -244,6 +244,7 @@ in
       description = ''
         Backup configuration.
       '';
+      default = {};
       type = lib.types.submodule {
         options = contracts.backup.mkRequester {
           user = options.services.forgejo.user.value;
diff --git a/modules/services/home-assistant.nix b/modules/services/home-assistant.nix
index 8f2189f..fa12881 100644
--- a/modules/services/home-assistant.nix
+++ b/modules/services/home-assistant.nix
@@ -143,6 +143,7 @@ in
       description = ''
         Backup configuration.
       '';
+      default = {};
       type = lib.types.submodule {
         options = contracts.backup.mkRequester {
           user = "hass";
diff --git a/modules/services/jellyfin.nix b/modules/services/jellyfin.nix
index adaeef8..975d5dc 100644
--- a/modules/services/jellyfin.nix
+++ b/modules/services/jellyfin.nix
@@ -154,6 +154,7 @@ in
       description = ''
         Backup configuration.
       '';
+      default = {};
       type = lib.types.submodule {
         options = contracts.backup.mkRequester {
           user = "jellyfin";
diff --git a/modules/services/nextcloud-server.nix b/modules/services/nextcloud-server.nix
index c0fed18..084d050 100644
--- a/modules/services/nextcloud-server.nix
+++ b/modules/services/nextcloud-server.nix
@@ -522,6 +522,7 @@ in
       description = ''
         Backup configuration.
       '';
+      default = {};
       type = lib.types.submodule {
         options = contracts.backup.mkRequester {
           user = "nextcloud";
diff --git a/modules/services/vaultwarden.nix b/modules/services/vaultwarden.nix
index 09415ab..83cf52a 100644
--- a/modules/services/vaultwarden.nix
+++ b/modules/services/vaultwarden.nix
@@ -131,6 +131,7 @@ in
       description = ''
         Backup configuration.
       '';
+      default = {};
       type = lib.types.submodule {
         options = contracts.backup.mkRequester {
           user = "vaultwarden";
@@ -231,9 +232,5 @@ in
     # TODO: make this work.
     # It does not work because it leads to infinite recursion.
     # ${cfg.mount}.path = dataFolder;
-
-    # Seems superfluous but otherwise we get:
-    # The option `shb.vaultwarden.backup' was accessed but has no value defined.
-    shb.vaultwarden.backup = {};
   };
 }