A client calls and tells us that his computer is not working. Our support staff attempt to get him going but there are no backups. His technician comes to help but cannot get the computer going. Finally, he brings us the computer, and we managed to get it working. When I spoke to him and told him to buy a few USB sticks for backup, he notified me sheeply that he sells them in the shop. He should have used one of them before this happened. If we could not have got his computer going not having a backup could have cost that shop thousands plus a lot of work.
The fact is that a computer is a mechanical device, and all computers will eventually fail. It does not matter how big or small you are, for example, there are continuous complaints from people that Google Gmail has lost their emails, and Gmail Help told them they couldn't recover them and there is nothing more that they can do for them.
Similarly I noticed that Apple stated in their contract "TO THE GREATEST EXTENT PERMISSIBLE BY APPLICABLE LAW, APPLE DOES NOT GUARANTEE OR WARRANT THAT ANY CONTENT YOU MAY STORE OR ACCESS THROUGH THE SERVICE WILL NOT BE SUBJECT TO INADVERTENT DAMAGE, CORRUPTION, LOSS, OR REMOVAL IN ACCORDANCE WITH THE TERMS OF THIS AGREEMENT, AND APPLE SHALL NOT BE RESPONSIBLE SHOULD SUCH DAMAGE, CORRUPTION, LOSS, OR REMOVAL OCCUR. It is your responsibility to maintain appropriate alternate backup of your information and data."
A backup is considered to be an obligation on the user.
In your Point-of-Sale system, a backup is crucial to your business. It should be done at least once a day.