Our support team will be happy to help you restore a backup file.
Could you do us a favor and shoot an email over to support@atticus.io, titled "Restore Backup" with your .json file attached? Alternatively, you can fill out the form at the bottom of the Support page https://www.atticus.io/support/ to get in touch with us.
Just let our team know what's happening, and our support team will be happy to work with you to get back on track ASAP.