If you want the service to stop entirely but don't want to uninstall it, you can disable its startup behavior:
Complete Guide: How to Disable McAfee Online Backup Disabling McAfee Online Backup can free up system resources and stop persistent notifications. Depending on whether you want to pause it, stop specific notifications, or remove the service entirely, here are the detailed steps to take control of your system. 1. Temporarily Suspend Backups
Disabling services via msconfig may cause McAfee’s main antivirus to flag a security issue. You can re-enable it anytime by re-checking the box.
If you want to keep the software installed but stop it from running automatically: