Small businesses you can buy a good server for R10-15 000. Then you might need a good backup device and software to regularly backup all the data on your server. A 24GB DAT Tape Drive will cost in the region of R5000. Server software can cost several thousand rands but we describe server options in more detail here . Most importantly, you will need some knowledge of your server's operating system to keep it running smoothly.
Servers require routine maintenance to keep working reliably.
Budget to go on some courses or to have a networking company set up your server and make regular visits. The most common network design is a star shape and uses a piece of hardware called a hub to link the machines together. Imagine a star topology as a wagon wheel with spokes where the centre of the wheel is the hub and the spokes are the network cables linking the machines. Hubs are relatively cheap and a 24 port low-speed hub will cost in the region of R1000. High traffic hubs can cost R3000.00 though this would seem unnecessary for your amateur efforts.