Most businesses now work around the clock, 24 hours a day- 7 days a week- 365 days a year. Because companies are constantly putting all of this pressure on their systems it’s important to make sure there is a failover, or at least some redundancy technologies included in their server.
The data centers found within organizations come in four different tiers, depending on their level of complexity. Ranking in order as tier 4 being the most advanced and tier 1 being the simplest.
You probably don’t need anyone to explain to you the advantages of redundancy. Almost everyone has learned this at some point, probably the hard way, for example by discovering at the last minute that a carefully crafted PowerPoint presentation is inaccessible because of equipment snafus like a laptop that gets stolen or is incompatible with the projector.