diff --git a/modules/matrix/default.nix b/modules/matrix/default.nix
index d1b2fc2..321e329 100644
--- a/modules/matrix/default.nix
+++ b/modules/matrix/default.nix
@@ -340,6 +340,7 @@ in
         "/var/lib/matrix-appservice-irc"
         "/var/lib/mautrix-telegram"
         "/tmp/matrix-synapse-backup.sql"
+        "/tmp/matrix-authentication-service-backup.sql"
       ];
       timerConfig = {
         OnCalendar = "*-*-* 05:00:00 Etc/UTC";
@@ -347,9 +348,11 @@ in
       initialize = true;
       backupPrepareCommand = ''
         ${pkgs.sudo}/bin/sudo -u postgres ${pkgs.postgresql}/bin/pg_dump -d matrix > /tmp/matrix-synapse-backup.sql
+        ${pkgs.sudo}/bin/sudo -u postgres ${pkgs.postgresql}/bin/pg_dump -d matrix-authentication-service > /tmp/matrix-authentication-service-backup.sql
       '';
       backupCleanupCommand = ''
         rm /tmp/matrix-synapse-backup.sql
+        rm /tmp/matrix-authentication-service-backup.sql
       '';
       pruneOpts = [
         "--keep-daily 7"