Retailer store owners like to focus on running their business and not playing IT managers (in general). One retail point of sale trend over the last 1-2 years is to "off-load" some typical IT related tasks to your point of sale solution provider. This is known as Managed Services.
For a monthly or annual fee, the place were you purchased the point of sale system from can then take of daily tasks like backing up the data and virus scans. They can also monitor your computer equipment to watch for potential problems using remote monitoring software. Finally, help desk support is usually included to take care of everything from simple questions to system failures.
Since everyone has different levels of comfort when dealing with computer equipment, a good question to ask your potential point of sale system provider is what level of managed services they offer (and make sure that support is included on evenings and weekends as well). Their level of service should take care of what you are not comfortable or do not have the time to deal with.
May sound simple but this is something that could save hours of your time each year.