All computer users should back up the critical data they have on their desktops, laptops and servers to protect it from loss or corruption. Saving just one backup file may not be enough to safeguard your information. To increase chances of recovering lost or corrupted data, follow the 3-2-1 rule.
Download: The 3-2-1 Backup Rule Infographic
For a more in depth discussion of backup options (pros and cons) refer to this US-CERT whitepaper.
Credit: United States Computer Emergency Readiness Team, Paul Ruggiero & Matthew A. Heckathorn