Linux is a natural. Unix has been making reliable backups since before any single-user server solution was a glimmer in its developers' eyes. Small businesses want those same reliable, secure solutions made available to them. One problem, my money is invested in my own business. There is even a business book by that title.
Professional investors are in the business of, well, investing.
They will find that companies that are using Unix and Linux are going to get more done with less capital outlay than their competitors. Again, I would bet that there are web sites that have the numbers to back me up. All other names and trademarks are the property of their respective owners.