Apple introduced a security feature to macOS Mojave in 2021 that requires users to grant permission to applications before they could access a user's protected files. The feature is called Full Disk Access.
Full Disk Access blocks Carbonite™ from being able to access files that you may want to back up. But you can change your preferences to allow Carbonite access to these files. Below are step-by-step instructions on how to do this.
Launch System Settings (or System Preferences in older macOS versions) by navigating to it from the Apple icon menu at the top left of the screen, or by selecting it in the dock.
From System Preferences, select Security & Privacy. In the Security & Privacy window, select the Privacy tab. From Privacy, select Full Disk Access.
On the lower left corner of the screen, there’s a padlock that allows authorized users to make changes to System Preferences. If the padlock is in the locked position, click it.
This should trigger a pop-up window that requests your Mac user name and password. Enter those credentials to open the padlock so you can make changes.
Now you can add Carbonite to the list of applications for Full Disk Access.
Click the plus sign beneath the Full Disk Access application window to add Carbonite to the list.
From the applications list, select the green Carbonite “dot” icon and click Open. (Note, if you’re using an older version of Carbonite represented by a black lock that appears in the Apple Menu Bar, see this Knowledge Base article for separate instructions.)
You should now see Carbonite listed in the list of applications for Full Disk Access. Click the padlock to lock System Preferences and prevent further changes.
To see a more detailed version of these instructions, along with screenshot, read this Knowledge Base article.