A good backup is more than storing a copy of your files. It is about security, about the integrity and reliability of your files. The question is not IF something goes wrong, but when! And IF it does, what can you do with your backup? If you have a copy of all your files on an external drive and you get a virus or ransomware then chances are you have lost EVERYTHING, including the data on your external drive that you thought was backed up.
Acronis lets you create truly reliable backups. Either a local backup or a double backup with added protection through the cloud. And if you buy Acronis Advanced or Premium , then antivirus/antimalware is included. Your virus scanner can go bye-bye, as Acronis will do that for you too.