There are many qualities of a good data center. The data center must be in a building that is stucturally sound and that would be difficult to destroy. This building must have a high level of security. Good quality equipment should be used as well as top quaity backbone providers.
A data center will need to have excellent cooling systems. They need excellent fire detections and suppression systems. Data recovery systems will also be needed.
Redundancy, multiple carriers, disaster-free location, security, and 24-hours staffing and NOC team to name a few more
Yes these are among some of the most important. You absolutely need multiple providers and a redundant infrastructure. I agree that 24 hour staffing is ideal in the best data centers.
I would say that you would have UPS for the power supply and other power backup as well. As mentioned you must also have system and data backup to ensure that there is not a major problem if any type of system failure or other crisis occurs.
Well a data center is a place and a facility that has a large building that has many volumes of electronic equipment, particularly computer equipment and also reams of information that businesses pr personal people need to run websites.