Regularly (weekly) check your antivirus software and apps for updates and install them. Without updates, your software can’t protect you from the latest threats. Don’t leave yourself open to attack!
To get the most out of your antivirus programs, set them to update automatically or to notify you when an update is available. This is also true for built-in services like Windows Defender.
Lifewire has a great article about ways to back up your data. Read more here.