How to use the 4 hard drives

I recently bought a MacPro that has 4 hard drives, the Time Machine has filled the 3 storage drives and the start up drive is full. How can I get more space on the drives without loosing everything on them?

Yes, you will lose the backups on those three drives. The thing is that if you need three hard drives for your Time Machine backup, then the backup drive capacity is too small for all the data on the startup drive.
Did you set up the Time Machine backup or are they from the previous owner? Relate this information, if you will:
Capacity of each hard drive (identify the startup drive.)
How much of each drive is used.
How much of each drive is available.
Why are three drives used for Time Machine?
You can get the information by selecting a drive. Press COMMAND-I to open the Get Info window. The information is displayed in the upper panel.

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