The 3-2-1 Backup Rule – Data Protection Strategy
Backups ensure that your critical data will survive any of the likely hazards. Too many individuals and companies have suffered from having their hardware lost or stolen, destroyed by fires or natural disasters, infected with malware or corrupted by targeted hacker attacks. Common sense dictates that all hard drives will eventually fail; the question is whether or not you are prepared for the worst-case scenario.
For a one-computer user, the backup strategy can be as simple as copying all important files to another device – or, ideally, several devices – and keeping them in a safe place. However, for multiple computer systems, things can be (and usually are) much more complicated, especially when it comes to virtual environments containing thousands of virtual machines. In these cases, a comprehensive data protection plan should include the 3-2-1 backup rule.
The 3-2-1 Backup Rule
The 3-2-1 backup rule is an easy-to-remember acronym for a common approach to keeping your data safe in almost any failure scenario. The rule is: keep at least three (3) copies of your data, and store two (2) backup copies on different storage media, with one (1) of them located offsite. To clarify, let’s take a look at each point of this rule.
Keep at least three copies of your data
Even a trivial event, such as a fire alarm triggering the sprinkler system could literally wash all your data away. Countless other incidents could bring about the same outcome – for example: theft, fire, a disgruntled employee exacting revenge for imagined slights, or the vandalism of a rioting mob. Therefore, having one backup isn’t enough, especially if it is stored in the same premises as the primary data and on the same type of media. Obviously, the more backup copies you have, the less chance you have to lose all of them at once. Thus, the 3-2-1 backup rule states that you need at least three copies of your data, meaning the primary data and two backups of this data.
Read the entire article here, The 3-2-1 Backup Rule – Data Protection Strategy
via the fine folks at NAKIVO.