I wouldn't worry too much. If the Buffalo is a real SSH server, it should be fine. (It could well be using the same SSH tool suite as CUCM itself: OpenSSH)
But why not just fire up Linux on an older PC or a VM ? Zero cost. CUCM backups aren't big. I've got 5 days of backups eating a massive 10GB - which is nothig nowadays.
GTG
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