When messing with Macrium Reflect and Easeus Todo, I think I found that both would make Images over the Network but only Macrium would restore.
And then you had to get the share address setup manually and maybe it was only the WinPE Recovery disc that worked. I can't remember.
I was trying different backup scenarios from my PC to Laptop with its ext USB hard drive (I don't have a NAS drive)
As mentioned in the link above, it may be easier just whipping the drive(s) out of your NAS and putting them in a USB caddy for making backups.