Does your business primarily operate by using data that you create and store? If so, you'll definitely need a disaster recovery solution in place to make sure that your data is protected. Here are some situations that justify the need for proper data backup.
Building Fires
Even if you're taking all the right steps to make sure that your data is protected from other people, there are some things that you simply cannot protect yourself from. Having all of your data on-site makes you vulnerable to data loss if the building were to catch on fire and your server is destroyed in the process. Nobody is going to be thinking about saving a bunch of hard drives the moment a fire starts and everyone needs to clear out of the building.
Natural Disasters
The same can also be said of natural disasters that can impact the building where your server is located. A tornado, earthquake, or flood can easily destroy a server to the point where you cannot recover the data from it anymore. This will leave you without the data you need to operate your business.
Theft and Vandalism
You never know when someone is going to target your business by stealing or vandalizing equipment. This can happen because someone specifically targets your business and destroys equipment, or because someone is trying to steal equipment to make a quick buck by reselling it. If the server is missing or destroyed, you'll lose all the data that is on there without disaster recovery.
Ransomware
When you operate a business with multiple employees, you do not know what they may accidentally do that can cause ransomware to be installed on your server. When that happens you have two options, you can either pay the ransom or go to a backup of your data that you saved with your disaster recovery solution. You can roll back your servers to the point before the ransomware was installed so that you don't have to pay to get your data back.
Drive Failure
Most servers are in a RAID configuration that allows a specific amount of drives to fail before data loss occurs. This means that you can survive a failure of one drive in the server, but you can lose data if two or more drives fail at the same time. Your disaster recovery solution will protect you by keeping the data in a second location so that it is protected from drive failure.