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Is this network design suitable?

I am setting up a new network as follows:
Server: Windows Server 2016, 2 NICs, 2 24port switches
Connects to 25 PCs (workstations) - 5 for admin and 20 for general users
I have two NAS Boxes - One to be used to backup data to, the other used to store data that is accesed by the 20 users and 5 admins and also host intranet.
Would there be any benefit in plugging the 2 NAS boxes into seperate NICs?
What about having 2 seperate networks - Admin & Users - whilst both would have access to their own data, some data would need to be shared between the two networks?
Looking at setting up a couple of Servers as Virtual Machines to provide the services the network needs, is it worth it or should i just have one Server do everything?

Any thoughts or comments are welcome.
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For a network that size I wouldn't over-complicate it with different networks/mutliple servers/etc. For under 50 users the best option is to keep it simple.

Have your one server as a domain controller with DHCP and DNS. Use security groups and Group Policies to restrict access to files/services on the network. If you do this based on user accounts then it gives you flexibility for users to work on other machines if their workstation is unavailable/broken.

Are the NAS drives Active Directory integration capable? If yes then I would set that up so you can control file access by NTFS permissions - will be much easier. If it isn't then see if you can present it as an iSCSI device to the server and allow the server to manage it with NTFS permissions.

Team the servers and nas drives (if possible) on the switches (one connection per switch) so you get better throughput/redundancy on the network.

You haven't mentioned what you are doing with emails. If you're hosting your own Exchange then create a separate VM for the Exchange server using Hyper-V (note that as the resources will be shared ensure you're physical server has enough resources for it).
What kind of switches? If they do stacking, like say the sg500 line, definitely use that and run one nic from each server/nas to each switch.
For the servers, assuming hyper-v, use Windows hyperv teaming (switch independent/dynamic). For VMware it just works.