The program needs an empty folder to back up to. Many customers were overwriting their backups with corrupt data. This prevents it from happening.
Create a folder on your computer called MasterCook Backups. Create a folder inside of it with today's date. Backup to the dated folder. Then in the future create a new folder with that day's date and backup to it. This way if you have files that became corrupt, at least you have incremental backups so you can retore from an older backup set that is not corrupt. In fact, many backup programs make incremental backups. It is a best practice.
Otherwise, you can use other programs to back up your data. See this article:
3 Ways to Create Automatic File Backup in Windows 10/11 Easily (minitool.com)