root disk full, locked out

Hi All:

My root disk is full on my readynas ultra 4.  I found this was due to some misbehaving upgrade with crashplan. I was able to keep ahead of it for a while, but after my recent reboot it came back up like a stock out of the box readynas.  I had to reset all of my services and my apple time machine and all other services are still not showing.  The biggest issue I have however is that I cannot ssh into my system to remove files out of the crashplan portion (/usr/local/crashplan).  I tried to re-download the plugin, but it says arch is not compatible.  I'm not sure where to go now to get this resolved.  I used the same plugin before.  I think that I have a catch 22 issue where the add-on won't install because the OS disk is full, but I cannot access the FS to get the OS disk clear of the junk.  Anyone have suggestions?  Netgear kindly reminded me that my support ended 4 years ago, but that pretty much leaves me up you know who's creek.