NAS box or small pc

Because it uses ZFS for its file system, and ZFS needs a lot of memory.

There are other NAS distributions, NAS4FREE used to be good and may have lower hardware requirements (assuming you don’t want it to use ZFS).
 
What do you actually want to use a NAS for?

A single drive NAS isn't terribly useful in terms of data protection, you may be better off with just a USB Hard Drive if it's just to perform a backup.

Benefit of a Synology over FreeNas or any other NAS OS is that it generally is set up and forget - they run basically forever, updating themselves, and only require any interaction if a disk fails or is likely to fail. You are paying for ease of use, but are also limited by the hardware capabilities (e.g. if you are using it as a media server and require transcoding, then you likely need a more expensive model)
 
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