Which of the following is not a part of 3-2-1 backup strategy?

Which of the following is not a part of 3-2-1 backup strategy?

• Different backup media vendors
• Multiple backup copies
• Different backup storage location
• Different backup media types 

EXPLANATION

The 3-2-1 backup strategy, also known as the Rule of Three, says that you should have at least 3 different copies of the data on at least 2 different types of media in at least 1 different location.

SOURCE

https://quiz.techlanda.com/2017/11/which-of-following-is-not-part-of-3-2-1.html