Hello @ggzik
Yes, you will need CALs for file services.
Any client requires a CAL in order to access the server. It does not matter what service they are using, they need the CAL..
In a client/server environment the normal process is for clients to store their files on the server and not on the client. This gives a centralized location to then back up.
Have a look at Client Access Licenses and Management Licenses for further details.
Thread for your reference: Do I need CAL for my Windows Server 2016 Standard if it's used only for data sharing?
Best Regards
Karlie
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