If you want to change your apple ID password, you can easily do this on your iPhone, iPad or iPod.
1. Tap Settings > [your name] > Password & Security.
2. Tap Change Password.
3. Enter your current password, then enter a new password and confirm the new password.
4. Tap Change or Change Password.
5. Sign in with your new Apple ID password again to access Apple features and services.
To check your backups of iPhone, iPad and iPod data in iCloud need to enter your Apple ID password, and if you don't use it frequently or didn't write it in the paper you may forget it, when you want to check backups in iCloud you may fail and in this case, you have to reset your password and you need to update your Apple ID and password in each service that you're signed in to. This is so inconvenient, what's more, forgetting a password would have been a troublesome thing.
In fact, you can set yourself free from iCloud or iTunes, they are not the only iOS device back up tool. Now we recommend you a professional iOS device data transfer freeware – Qiling MobiMover Free to help transfer iPhone, iPad and iPod files to computer as backups and you can check them without the password.
Step 1. Connect your iPhone/iPad to your PC, unlock your device, and trust the computer. ThenrunQiling MobiMover and navigate to "Backup Manager" > "Back up".
Step 2. Check the categories you want to back up from your iPhone/iPad and then click the backup button to start backing up your device data.
Step 3. Wait for the backup process to complete. If you need to restore the backup to your iPhone/iPad in the furture, go to "Backup Manager" > "Restore" to get it done.