I agree several services that NethServer offers, are also available on a Synology NAS. But the hardware of the Synologu NAS is in a lot of cases the bottleneck. Poor CPU, very limited RAM…
NethServer can be installed on any x64 based system.
If you think Synology has more to offer for you, it is also possible to install the Synology OS on default hardware. See https://xpenology.org/
IMO NethServer is a lot more flexible and has several more options.
And if you need to use a firewall/gateway, I would never use a device that also is used for storing (sensitive/personal) data.
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