diff --git a/docs/prune-simulator/prune-simulator.js b/docs/prune-simulator/prune-simulator.js
index 37d97e2c..7d792383 100644
--- a/docs/prune-simulator/prune-simulator.js
+++ b/docs/prune-simulator/prune-simulator.js
@@ -480,18 +480,19 @@ Ext.onReady(function() {
 
 		let finished = false;
 
+		backups.forEach(function(backup) {
+		    let mark = backup.mark;
+		    if (mark && mark === 'keep') {
+			let id = idFunc(backup);
+			alreadyIncluded[id] = true;
+		    }
+		});
+
 		backups.forEach(function(backup) {
 		    let mark = backup.mark;
 		    let id = idFunc(backup);
 
-		    if (finished || alreadyIncluded[id]) {
-			return;
-		    }
-
-		    if (mark) {
-			if (mark === 'keep') {
-			    alreadyIncluded[id] = true;
-			}
+		    if (finished || alreadyIncluded[id] || mark) {
 			return;
 		    }