Just two weeks ago, I faced the Intuit Data Protect Error on my system. Quickly, I went on the web to look for some possible solutions and got these steps that helped me to overcome the issue.
Open the Windows Explorer by pressing Windows + E. Go to the folder that contains the files that IDP fails to backup. Click on the white space in the address bar to show the full file path. Copy the file path and paste it into Microsoft Word. Check if the path has 200+ characters, if it does, bring it under 200.
For more solutions on the same, click here. However, if you require external support on the issue, call on xxx-xxx-xxxx anytime.