The correct answer is 'Three copies of data, on two different media, with one copy offsite.' This approach aligns with the 3-2-1 backup rule, which states that you should have three copies of your data (one primary copy and two backups), on two different storage types to protect against device failure, and with one copy offsite to secure against local disasters. 'Two copies of data, all on different cloud providers, none offsite' does not meet the rule's criteria since it lacks a third copy and offsite storage. 'One copy of data onsite and one copy offsite' falls short by not having the recommended number of data copies and media types. Lastly, 'Four copies of data, two on-premises, two offsite' exceeds parts of the rule but does not mention the use of two different media types, which are critical for a robust backup strategy.