Backup is important but it is just as important to remember that having one backup copy is sometimes not enough. For example, let’s assume that you backup your computer to an external drive, which you keep in your home office. If your computer crashes, you have the backup copy. However, if a fire breaks out in your home, it will destroy both your computer and the external drive.
For this reason, Acronis has created the 3-2-1 rule (video):
By keeping backup copies both locally and offsite – perhaps in the cloud - you double the protection of your data in the event of any unforeseen event or disaster.