Backing up to external drive connected to another mac on network

My sister has an external drive connected to her iMac which she backs up her Mac to using Time Machine. I have a Mac Mini downstairs that I would also like to back up to the drive (also using Time Machine.) Is there any way to mount the drive on the Mac Mini downstairs over the network and use Time Machine to back it up?
Thanks in advance!

In System Preferences/Sharing, check to File Sharing, on her machine. It should show up as a choice, when you connect to her. Then, once mounted, drag it's icon to the right side of the dock. Just click that next time you need to connect.

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