What size PR4100 system should I get if I currently have 12TB of files

My Cloud OS 5 Personal & Network Attached Storage My Cloud Pro Series
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What size PR4100 system should I order if I currently have 12TB of data? I want to have room for expansion plus backup. Thinking about using RAID however not familiar with it. How much space would I need for RAID?

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Hi @bloop1000,

Please refer below article How to Upgrade the Drives on a My Cloud Device (RAID Expansion):
https://support-en.wd.com/app/answers/detail/a_id/27421

For more information please check the article My Cloud RAID Online User Guide and Solutions:
https://support-en.wd.com/app/answers/detail/a_id/25488