3-2-1 Rule for backups

A quick reminder on how the 3-2-1 backup rule still makes sense.

Regular readers of this blog have heard me talk about the 3-2-1 rule for backup. This rule has been around for decades and it is still as relevant today as it was in the past.
Let’s review

3 copies of data.
You should have 3 copies of your data in case of hardware or data corruption.


2 media types.
Your data should be stored 2 different ways. In the past this primarily meant one copy on dvd or tape. These days this could mean 2 different brands of hard drives or 1 copy on a hard drive another using a cloud based backup services like backblaze.


1 of them offsite.
In case of theft, fire or flood at the location your computer is you must have another copy in a different physical place. Cloud backup is the easiest way to do this, but even taking the third copy to a safety deposit box or a relative’s house will do the job.


By following the 3-2-1 backup rule as part of your backup system it will ensure your data is safe.