An organization's Chief Financial Officer (CFO) is concerned about losing access to very sensitive, legacy, unmaintained PII on a workstation if a ransomware outbreak occurs. The CFO has a regulatory requirement to retain this data for many years. Which of the following backup methods would BEST meet the requirements?
- A daily, incremental backup that is saved to the corporate file server
- An additional, secondary hard drive in a mirrored RAID configuration
- A full backup of the data that is stored off site in cold storage
- Weekly, differential backups that are stored in a cloud-hosting provider
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