When I try to save a System Backup snapshot of my Drive C (size 349 GB, 225 GB free) to a share on my Western Digital NAS, it won't let me, saying I need at least 26.9 GB of free space to create a snapshot. The NAS has 889.06 GB free, no quotas, but for some reason System Backup doesn't seem to accept this. If I change the snapshot destination to a local hard disk with rather less free space, it runs fine. Meanwhile, Paragon Drive Backup 10 has no problem saving archives to the same NAS share. I'm using Win7 x64 and build 10505. Any thoughts?