I had 4 biz's to start out with, all of them I do some repair work for. I asked them about a back-up server, they said they would do it. I was looking at about $250 a month. I would just measure by files and folders created and total usage. Like $10/Gigabyte per month. Hey, looks like spare cash to me. $2000 server, I would build an $800 computer and pop 4 HD's in it as needed. Once the business flourishes a bit, then you may wanna consider the $2000 server. It doesn't have to be fast, I was looking more to reliability and security. If the connection went down, since I am working with local clients, they can call me and I will bring the files to them on an external HDD.