diff --git a/machines/overwatch/configuration.nix b/machines/overwatch/configuration.nix
index d6ece49..461a0e5 100644
--- a/machines/overwatch/configuration.nix
+++ b/machines/overwatch/configuration.nix
@@ -83,6 +83,7 @@ with lib;
 
   services.prometheus = {
     enable = true;
+    retentionTime = "1y";
     port = 9001;
 
     scrapeConfigs = [