how to restore from the backup archive?

Hello,I emptied the Deleted Items folder.
During EMClient process was completed by only reporting an error. When it is reopened, it has downloaded the emails from the server (over 4000). But all the folders are empty, including the sent items.
How can I restore the status quo from the backup I made three days ago?
Please answer in a complete and simple because I do not get much information.
Thank you so much, Marco

Hello Marco,
go to Menu>File>Restore and restore from your backup.