diff --git a/nix/sources.json b/nix/sources.json
index 364812d..8ccab26 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -55,6 +55,18 @@
         "url": "https://github.com/nmattia/niv/archive/5830a4dd348d77e39a0f3c4c762ff2663b602d4c.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
+    "nixos2111": {
+        "branch": "nixos-21.11",
+        "description": "Nix Packages collection",
+        "homepage": "",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "63198c9ccefdbd337cef0d85db0ea2689f4ce418",
+        "sha256": "05gc6xyv8a2dppngm1q44j85j769lr90lg20s6jv62gfg344i50r",
+        "type": "tarball",
+        "url": "https://github.com/nixos/nixpkgs/archive/63198c9ccefdbd337cef0d85db0ea2689f4ce418.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "nixpkgs": {
         "branch": "nixos-22.05",
         "builtin": false,
diff --git a/profiles/gitea.nix b/profiles/gitea.nix
index fbe56e5..faee3a4 100644
--- a/profiles/gitea.nix
+++ b/profiles/gitea.nix
@@ -64,6 +64,8 @@
     ];
   };
 
+  services.postgresqlBackup.databases = ["gitea"];
+
   services.nginx = {
     enable = true; # Enable Nginx
     recommendedGzipSettings = true;
diff --git a/profiles/hydra.nix b/profiles/hydra.nix
index 7aa177a..246270c 100644
--- a/profiles/hydra.nix
+++ b/profiles/hydra.nix
@@ -39,6 +39,8 @@
     ];
   };
 
+  services.postgresqlBackup.databases = ["hydra"];
+
   networking.firewall.allowedTCPPorts = [config.services.hydra.port];
 
   #services.hydra-dev = {
diff --git a/profiles/matrix.nix b/profiles/matrix.nix
index a7b721e..2379762 100644
--- a/profiles/matrix.nix
+++ b/profiles/matrix.nix
@@ -145,6 +145,8 @@
     };
   };
 
+  services.postgresqlBackup.databases = ["matrix-synapse"];
+
   security.acme = {
     acceptTerms = true;
     certs = {
diff --git a/profiles/nextcloud.nix b/profiles/nextcloud.nix
index 6bc18d7..0d4df57 100644
--- a/profiles/nextcloud.nix
+++ b/profiles/nextcloud.nix
@@ -45,6 +45,8 @@
     ];
   };
 
+  services.postgresqlBackup.databases = ["nextcloud"];
+
   services.nginx = {
     enable = true; # Enable Nginx
     recommendedGzipSettings = true;
diff --git a/profiles/server_common.nix b/profiles/server_common.nix
index 4b11832..10a4e81 100644
--- a/profiles/server_common.nix
+++ b/profiles/server_common.nix
@@ -4,7 +4,10 @@
   pkgs,
   lib,
   ...
-}: {
+}: let
+  sources = import ../nix/sources.nix;
+  nixpkgs2111 = (import sources.nixos2111 {}).pkgs;
+in {
   imports = [
     ../profiles/openssh.nix
     ../secrets/user-craige.nix
@@ -16,6 +19,15 @@
     withUtempter = true;
   };
 
+  services.postgresql = {
+    package = nixpkgs2111.postgresql_9_6;
+  };
+
+  services.postgresqlBackup = {
+    enable = true;
+    compression = "zstd";
+  };
+
   security.polkit.enable = false; # avoid CVE-2021-4034 (PwnKit)
   services.udisks2.enable = false; # disable udisks2 which enables polkit
 }
diff --git a/profiles/tt-rss.nix b/profiles/tt-rss.nix
index 249cdde..462b71d 100644
--- a/profiles/tt-rss.nix
+++ b/profiles/tt-rss.nix
@@ -43,6 +43,8 @@
     ];
   };
 
+  services.postgresqlBackup.databases = ["tt_rss"];
+
   services.nginx = {
     enable = true; # Enable Nginx
     recommendedGzipSettings = true;