[user/module/restic-backup] Fix backup collisions

users/modules/restic-backup.nix

@@ -81,7 +81,10 @@ in {
     systemd.user.timers.restic-backups-to-elysia-clarki = {
       Unit = {Description = "Run restic backups every hour";};
       Install = {WantedBy = ["timers.target"];};
-      Timer = {OnCalendar = "hourly";};
+      Timer = {
+        OnCalendar = "hourly";
+        RandomizedDelaySec = "600";
+      };
     };
   };
 }