While there is no restore functionality built into the free version of the plugin, you can still restore your backups manually via FTP and phpmyadmin. A regular full backup is just a zip archive of your WordPress installation, plus a dump of your database (and some extra files). But you can unzip the backup and “install” it almost like a regular WordPress site.
The plugin FAQ has a link to our documentation with a manual restore guide: https://backwpup.com/docs/how-to-restore-a-wordpress-backup/
If you have any issues with your job or backup handling, then we are happy to assist.