Does Time Machine backup items on the time machine disk?

If I designate disk B as my Time Machine disk, are items on disk B, that aren't part of what Time Machine puts there, backed up?  In other words, can I use a disk for both storage and Time Machine backups and have those stored items backed up too?

If you intend to use disk B as both a Time Machine Backup Disk and a Data disk to hold your files, the only way to do that would be to partion the Disk B volume.
How do I partition an external hard drive ?
When an external is connected to a mac, the computer sees that Hard Drive as a Volume. Paritioning the volume is the ability to "Split" the volume in more parts that are limited by size. Time Machine will use the entire partition of a volume if the whole volume is used as a single partition. If you use the right tools and "Split" the external hard drive in smaller logical volumes then you can comfortably use the external hard drive for both your Time Machine Backups and your Data that you want to carry on an external drive.
The easiest way to partition a volume in more the one partition or logical volumes is to use the Disk Utility application that comes with every mac. Use the Finder to go to your Utilities folder and open Disk Utility, or search for it in Spotlight.  Whit Disk Utility you can select your external Hard Drive and either change the partition to add a second one or erase all data on the existing external hard drive and create 2 Partitions that you can adjust in size. Remember Make sure you understand that if you choose to erase the existing external drive to make room for a new partition , that all data present on the external drive will be deleted.
Now that you have your two new partitions you can assign one to Time Machine and use the second one for Data. And with Time Machine Options you will be able to exclude or include your new external data partition to backup to your new Time Machine Backup Partition !

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