Error "operation not permitted" macOS

Since macOS 10.14, Apple has introduced a new privacy flow. The user is now asked for permission when an app requires access to certain features or functions. The user will need to explicitly grant "Full Disk Access" to the Magnus Box Backup application.

Mac "Operation Not Permitted" Error resolution procedure:

1. Open 'System Preferences' and go into 'Security & Privacy'
2. From there, scroll down and select the "Full Disk Access" item
3. Enable Magnus Box to access it by clicking the checkbox
4. Select the "Files and Folders" item and give Magnus Box permission there as well

Note: Remember to unlock the settings in the lower-left corner