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?
Edit: If anybody from Code42 is reading here, you are welcome to write an answer as I believe this is of general interest for everyone wanting to use CrashPlan. Maybe a document already exists which you can link to in the reply.