I have been using CrashPlan for a while internally (i.e. local backup server). I

Question

I have been using CrashPlan for a while internally (i.e. local backup server). I would also like to setup off-site backup but my experience is that I have to forward a port from the router sitting at the perimeter of the network where my offsite server is to be located. Otherwise, the client and server cannot see each other.

However, I am reluctant to forward a port to the CrashPlan server without knowing what I am exposing but I have not been able to find any information about the network protocol(s) used by CrashPlan (non-Business edition).

Does anybody know what network protocols and/or encryption CrashPlan is using when communicating and can it be considered safe to forward a port from the network perimeter down to a CrashPlan server?

Explanation / Answer

The connections CrashPlan uses are encrypted using TLS. (I've casually seen the traffic when looking at other things.) As for whether or not it's safe: the protocol doesn't really matter, only whether CrashPlan has exploitable bugs in their software, and that's pretty hard to discern without either extensive reverse engineering or access to their source code.

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