diff --git a/CHANGELOG.md b/CHANGELOG.md
index ae188d0b..f423a1a5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -71,6 +71,7 @@ Special thanks to @khassel, @rejas and @sdetweil for taking over most (if not al
 - Update Eslint config, add new rule and handle issue
 - Convert lots of callbacks to async/await
 - Revise require imports (#3071 and #3072)
+- Use `config.js-old` instead of file with timestamp suffix when backing up config with a `config.template` in use (#3104)
 
 ### Fixed
 
diff --git a/js/app.js b/js/app.js
index fa0fb71a..80ec75d2 100644
--- a/js/app.js
+++ b/js/app.js
@@ -76,7 +76,7 @@ function App() {
 			// save current config.js
 			try {
 				if (fs.existsSync(configFilename)) {
-					fs.copyFileSync(configFilename, `${configFilename}_${Date.now()}`);
+					fs.copyFileSync(configFilename, `${configFilename}-old`);
 				}
 			} catch (err) {
 				Log.warn(`Could not copy ${configFilename}: ${err.message}`);