How do I restore a Threema Safe backup?

There are PDF documents for the different platforms available where all backup options are explained in detail:

Overview of All Backup Options

Threema Safe backups can be restored in the setup wizard. To restore a Threema Safe backup, you will need your Threema Safe password and your Threema ID. If there is already a Threema ID set up on your device, delete it first:

Android

In Threema’s main screen, tap on “My Profile”
Tap “Delete ID”

iOS

In Threema’s main view, select “Profile”
Scroll to the bottom, and tap “Remove ID and Data”

In the setup wizard, select “Restore from backup,” and follow the on-screen instructions.

If you don’t remember your Threema ID, you can tap “Forgot your ID?” to retrieve it. This only works, if you have linked it to a phone number or email address.

If you don’t remember the password of your Threema Safe backup or your Threema ID, there is no way to restore it.