Windows Small Business - centralized backup solution for network workstations

Windows Small Business - centralized backup solution for network workstations

We have a Windows domain-based small business network, about 30
workstations and 1 server. In addition we have a NAS device.
I want to make the computer system more secure and stable. I need a
solution for backup workstations and server.
Features: - central storage for backup files (NAS or Server) - when user
starts his machine, before login, an incremental backup made from
specified files (or full machine, bare metal...) to the central storage -
if needed, we can restore the backed-up data to the client machine (even
to different hardware)
Do you know any solutions, sotfware for this?
Thanks in advance!
p.s.: sorry for my bad english (I hope you understand my question)