Timeshift does not back up files

I have a folder with 9 subfolders that my other drives/partitions are mounted to. When I set up and run Timeshift it should back up the content of the mounted folders like it is on the Linux OS drive, but it doesn’t. Can I exclude that folder or the content in its subfolders?

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Timeshift for Linux is an application that provides functionality similar to the System Restore feature in Windows and the Time Machine tool in Mac OS. Timeshift protects your system by taking incremental snapshots of the file system at regular intervals. These snapshots can be restored at a later date to undo all changes to the system.