The 3-2-1 Backup Rule Explained (and Why It Now Needs Immutability)

The 3-2-1 backup rule - three copies of your data, with one immutable copy kept offsite

The 3-2-1 backup rule says you should keep three copies of your data, on two different types of storage, with one copy offsite. It is still the foundation of a sound backup strategy. But ransomware now targets backups directly, so most experts extend it to 3-2-1-1-0: one copy that cannot be changed, and zero errors […]