Can I backup my MacBook Pro as well as my iMac to this hard drive?

Is this possible by connecting the hard drive to the computers by usb seperately and then backing up or do I have to set up a server with one of the computers? Thank you.

G-Technology 4TB G-DRIVE Desktop Hard Drive - USB 3.0

G-Technology 4TB G-DRIVE Desktop Hard Drive - USB 3.0

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