Business web hosting is an important matter. Hosting sites for businesses means that the business is relying on you to keep their site up for them, if for any reason it was to go down their company could lose lots of potential dollars and that needs to be avoided at all costs. In most respects web hosting for a business is not much different than hosting for any other client, they all expect their websites to be up when they need them, but businesses tend to have a lot more riding on their site being up than clients that just have say, a personal site they want hosted. So when hosting businesses you should always try to keep multiple servers with the same information on them, or at the very least a server that you can quickly swap in should one go down. You do not want downtime of any substantial period when hosting a business because it could be very bad.
There is also the problem of security. Sometimes certain companies may become the target of hackers who wish to do the business harm. Maybe they were a former employee who thought they were treated unjustly while on the job or maybe they were a customer who did not feel they were treated the best they could be while obtaining goods and services from them and they wish to teach them a lesson.
In either case it could result in the company’s site becoming inaccessible because of an attack on the site, this attack could put up a permanent block on the site for as long as the attacker of the site wants, making any outside traffic that tries to access the site unable to do so even if the server is in tip top shape, so you should always make sure your servers are protected as best as possible to make such attacks as hard as possible, and if it still happens make sure you are able to respond in a quick fashion and get the problem under control before any lasting damage is done.