setup NFS. That's what it's there for.
it's usually installed by default.
All you do is create an /etc/exports file with a line like this:
/data 192.168.1.0/255.255.255.0(rw, no_root_squash,sync)
the first part is the folder you want to share, then the IP/subnet mask of your network. The other options are explained better in the docs. (man exports)
HTH
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