Double backup two MacBook Pros each physically connected to their own external disks?

We have two MacBook Pros 17" (an early 2008 and a late 2011) connected by WiFi, both running OSX 10.9.3 and each physically connected to their own My Book external disks.  After I started the first MacBook Pro's backup to add the second MacBook Pro's external disk, I couldn't set up the second MacBook Pro's backup to add the first MacBook Pro's external disk.  Each of these My Book external disks had previously been used for backing up each MacBook Pros.  None of the help pages helped. 

On the computer to which the drives are connect enable File Sharing via Sharing preferences. Select the drives you want shared and CTRL- or RIGHT-click then select Get Info from the contextual menu. In the upper pane is a checkbox labeled "Shared." Check the box to enable sharing the device.
On the other computer select Connect to Server from the Finder's Go menu. Click on the Browse button to locate the shared computer. Double-click on the icon which should bring up a login dialog. Log into the admin account of the shared computer using the Registered User button. You will then be prompted for the admin password of the account. Enter it and click on the OK button. This should connect you and provide access to the shared computer and devices connected to it that have been marked as shared.
For more help select Mac Help from the Finder's Help menu and search for "file sharing."

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