Used SAMBA for years to connect my various Amiga systems to a WHS server via simple shares, worked fine.
Now using FreeNAS rather than WHS and works just as well.
My backup needs are very simple Amiga side, so I just do a simple complete hard disk copy from my SAM440ep to a designated shared directory on the NAS box once a week via a script and a cronjob. Takes a couple minutes over gigabit copper.