Cannot backup from PC to NAS

I have been using QuickShadow from Quicklytech. It can be set to synch the whole PC or any drive or path on the PC. It also can be set to monitor changed files and update them on the NAS. If you are connected it will do that in real time. If not, (say you are at work) it will defer the updates and process them when it sees the NAS. Also, if you have queued up a bunch of files and then use readyNAS remote, it will unload to your NAS when it connects. There is a full function free trial - I think 30 days. You can keep using it in free mode but you loose a little bit of functionality but it's still pretty useful. I think it costs $25 for full version. Check it out.