Step 1: If the backup file is on your computer, upload it to the server.
If you have a backup file on your hard drive, you must upload it to the /backups directory. This can be done through FTP client or by clicking on the "System Info & Files" -> "File Manager" in the main menu. You can find more info how to upload files here.
Step 2: In the backup menu, select the file to restore.
Once you have uploaded desired files, return to backups section and press Restore Backup button. You will see all the backup files in the /backups directory listed in the dropdown menu. Choose the file you want to restore.
Step 3: Select the items to restore.
In the file below, only "E-mail" items were backed up. (Note that items not backed up do not appear in selection menu).
At this stage, you can choose which items to restore. For example, in the above picture, we are choosing to restore all e-mail items except for vacation messages.
After you are finished, click the "Restore" button.
If the restore is successful, you will see "restore will run in the background" notification. After restore is complete, you will get notification message about successful restore.
