![]() NB – Just a quick side note here, if you do backup to an external hard drive try and keep it unplugged when it is not being used for backing up. ![]() With this in mind it should hopefully become clear why many IT professionals (and the 3-2-1 backup rule itself) always advocate for keeping multiple backups of data across multiple different mediums. Of course, this method is not advised as an issue with this main hard drive (hardware failure, ransomware etc.) would now mean two copies of your data could be wiped out in one go! Making use of at least two different storage mediums (devices) is an important practice and a key part of the 3-2-1 backup rule! It is possible with almost all backup software to make a backup and store this backup on the same disk as your PC is normally working with. For example, if you PCs main hard drive dies (or is affected by ransomware etc.) then you will still have 2 additional copies of your data across 2 separate data storage mediums to recover from. The reason 3 copies are needed, across 3 different mediums, is to help make the storage of backup data more resilient. (1) Having one copy of the data stored off-site (this could be via a cloud storage service).(2) Having 2 copies stored locally on at least 2 different mediums (for example one on a PC and another on an external hard drive).(3) Having at least 3 copies of your data on at least 3 different mediums (devices) at any one time.Making use of the 3-2-1 backup strategy means adhering to the following rules when it comes to the backing up and storing of your data: The 3-2-1 backup strategy is a great way of making sure your important data is kept safe, this is mainly thanks to multiple copies of any data being kept at any one time. ![]() In this guide I will look at one of the most commonly used approaches to providing such safe backups, this being the 3-2-1 backup strategy. When it comes to making sure your important data is kept safe, a well planned backup strategy taking into account the making of multiple copies of important data can be of great help.
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