How to Remove Backup Destination Reference

I'm using SSR 2013 R2 on Windows 10. On my SSR's Home tab, the lower left pane for Backup Destination lists two drives: 

#1. F:\(Unavailable) - this is an incorrect destination (no pie chart)

#2. [SSR-Backup Drive] (F:\) - this is the correct backup destination (normal pie chart)

How do I remove #1, since it's a false Backup Destination?