Switch from no RAID to RAID 1 without losing data

I've seen this question in the following https://rdsrc.us/l15KV4 discussion but when starting the conversion, see the following warning.
Convert-disk.JPG
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Abraham DeutschIT professionalAsked:
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cwstad2Commented:
If you dont have a multiple OS's installed then converting should be fine

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Gerald ConnollyCommented:
Dont forget to do a Full Backup first - Just in case!

Never do a change in your storage config without making a full backup beforehand
Abraham DeutschIT professionalAuthor Commented:
I'm am running a backup now and than will do the change.
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cwstad2Commented:
ok let us know how you get on
Abraham DeutschIT professionalAuthor Commented:
Did but the option described in the above article is not found.

"When they have been converted, right click on the main part of the drive and "add mirror" selecting Raid 1"
Abraham DeutschIT professionalAuthor Commented:
Is there any other way how to Switch from no RAID to RAID 1 without losing data?
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