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Log into rescue mode and type 'installimage' without the quotation marks, set 'RAIDLEVEL' from '1' to '0', you can alter things like host name and partition sizes further down if you need to, hit F10 and save the config, and hit 'Yes', after that it's pretty self explanatory. As to loosing 'protection', SSD's are inherently reliable compared to mechanical drives, the likely failure is due to data written (and you need to write a lot for a long time on a modern TLC drive), i'd be impressed if you managed to wear one out, but using R1 you'll likely hit the limits on both at roughly the same time relatively speaking, which kind of defeats the point. Besides, you have a backup and restoring a server is hardly a massive issue in this scenario.