Does the OS5 upgrade leave my data intact, or does it wipe the drives?
A very strong suggestion before updating to OS5. Read through the various OS5 subforums to see the various issues quite a few are experiencing/having. Pay particular attention to the OS5 Pro Series subforum for your device (PR4100). Review the various WD Knowledgebase Articles on OS 5 to ensure you won’t loose any OS 3 features/options that you currently use. In some cases there is no replacement in OS 5 of a feature not carried forward from OS3.
OS 5 Pro Series
https://community.wd.com/c/os5/my-cloud-pro-series/256
My Cloud OS 5: Feature Differences Between My Cloud OS 3 and My Cloud OS 5
https://support-en.wd.com/app/answers/detail/a_id/29389
While an update from OS 3 to OS 5 should leave your data intact, one should exercise caution and always backup one’s data before doing a firmware/operating system update.
My Cloud OS 5: How to Update From My Cloud OS 3
https://support-en.wd.com/app/answers/detail/a_id/29813
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@owsi
How to Update to My Cloud OS 5 - My Cloud OS 5 Personal & Network Attached Storage / Announcements - WD Community
Latest My Cloud OS 5 Personal & Network Attached Storage/Announcements topics - WD Community
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The upgrade deletes data used by some applications. It should not delete the data that you coped.
In my case, I lost the WordPress MySQL Database created by thje WordPress App in my PR4500… 
Daniel
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