Because small businesses are the low hanging fruit in the world of hackers and vulnerable to excessive downtime. There are literally dozens of ways hackers and viruses can access your network–undetected—to access and remotely control your network, corrupt your data and hold it for ransom, and use your network as a conduit for spreading spam, viruses, and even illegal software.
A poorly running business network costs the business owner far more than another IT bill. When employees are fixing their own computers, grabbing another cup of coffee as their PC reboots again, installing an update during customer facing hours – you're losing serious productivity and money.
Computers demand constant attention. There are numerous system checks and updates that should be done on a regular basis to ensure maximum speed, performance, and security. Ignore them and your system will get progressively slower, unstable, and susceptible to viruses, ransomware, and hackers. Data backups have a failure rate of 100% --that means all data backup will fail at some point, often without warning. You don't want to find out that your backup was not working the day after you have a data loss.