What AppKeeper backs up and what it can't

AppKeeper backs up the app itself (the APK). It can't back up app data such as logins, settings, chats or game progress: Android doesn't let apps read other apps' data without root.

Every Android app keeps its data in a private space that only that app can open. That's what stops a random app from reading your messages or your banking app's login. It also means no app from Google Play, AppKeeper included, can copy another app's data. Tools that do it need root access, and AppKeeper doesn't ask for root.

Where your data lives instead

In your account. Many apps keep your data on their own servers. Sign in again after restoring and it comes back.
In the app's own export or backup. Chat apps, note apps and password managers often have one in their settings. Use it before you reset a phone or roll an app back.
In Google's backup. Android's own backup, in Android settings, saves data for apps that support it and restores it when you set up a new phone with the same Google account.

Also not backed up

Apps protected by the store. Some apps can't be copied out of the phone. AppKeeper shows them as Can't be backed up.
Apps that came with the phone, unless you turn on Show system apps. They're hidden by default.

Why APK backups still matter

Exact versions. Google Play only offers the newest version. A backup lets you roll back after a bad update.
Apps no longer on Google Play. Once an app leaves the store, a backup is the only way to install it again.
No download needed. Restore from your folder or SD card, without waiting for Play, on slow or no internet.

Before a reset or a new phone

Back up your apps in AppKeeper, then go through the apps whose data matters to you: check you know your sign-ins, and run each app's own export. Make sure Google's backup is on in Android settings. Together, that covers the app and its data.

Restoring, step by step