McAfee antivirus DAT updates fail after running the file from the shared network. And you will get an Error message “Unable to the backup existing file, not enough rights”. If you are also facing this issue and want to know how to fix McAfee backup existing file error, then contact McAfee support number UK and our team will be able to troubleshoot all the following issues.

https://www.mcafeesupportnumber.co.uk/blog/mcafee-error-unable-to-backup-existing-file/