What is the 3 2 1 backup rule?

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Tags

1. #offsite
2. #three
3. #storage
4. #almost
5. #different
6. #copies
7. #failure
8. #media
9. #backup
10. #acronym
11. #approach
12. #located
13. #remember
14. #scenario
15. #least
16. #keeping
17. #store
18. #common