@Thomas Lee
I had the same problem using wbadmin to make a backup locally on a LOCAL drive eg f:\day1, giving me the error "The specified backup location could not be found or is not a supported backup storage location."
I solved this using the unc path to the local server \\myserver\f$\day1 !Somehow wbadmin refuses backup to a local NTFS drive (not a dedicated backup drive), even if I excluded it.
Command (run as Aministrator) I got working:
C:\>wbadmin start backup -backuptarget:\\myse
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