Question - What denotes how quickly an archive is taken?

Does anyone know what denotes how quickly an archive is taken?  Through the week, we run 5 archives that will be backed up to a SAN and then copy over to a tape using Netvault.  Recently, the archives have slowed right down to a point where some of the archives, generally around 8TB in size, can take 6 days to complete which means that the 5 archives a week can't be done.  The archive speed seems to be sporadic, between 5MB/s up to 30MB/s and we've even seen some at 100MB/s but will generally chug along at around 8-10MB/s.

It's a DL4300 box with 2x10Core cpus and 128GB of ram, the SAN is on a 10GB link that  the DL4300 never comes close to ever saturating.  We've tried reboots to clear down some memory usage, we've tried clearing out the antivirus to see if the antivirus was upsetting anything but it still seems to speed up and slow down and chugs along.  The slow down seems to have happened around the update from 6.2.1 to 6.3 and we also have repeated Schannel errors in the System Event viewer - "A fatal alert was received from the remote endpoint. The TLS protocol defined fatal alert code is 46." that also correspond with the 6.3 update, haven't found any other people with this issue on a Rapid Recovery machine and all the google links i've looked at in regards to this error point to Exchange servers and certificates, we don't run Exchange and the DL4300 server is off domain and isn't changed at all, apart from for Windows and driver updates, which are all up to date, the only other thing it does is it runs the HyperV server for the exports but only a basic Netvault server is run on that.. 

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