Hi Lorenzo,
Thank you for reaching out! The important thing here is you must have Total Upkeep installed on the destination website as well.
When performing a restoration from a file you need to select Total Upkeep from your WordPress Dashboard. Click the Upload Backup button at the top of the page. Then click Choose File, Select the file, then click Upload.
Once your file is uploaded, click the backups tab and you’ll see a list of any backups you have available. Click the View details button next to the backup you want to restore. Then click the Restore button in the Download & Restore section. Click through the prompts and your restoration will initiate.
I hope this helps Lorenzo! Please let us know if we can answer anything else for you!