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- Get backups sorted out before you consider using it as a production system.

If OP had iterated on having a backup system BEFORE adding important data, they wouldn't have consequences to trying to implement it. At the very least, do an online, filesystem level backup of the things that are important before trying to block level disk copy things. Run a database dump, rsync it to an external location, put important things in version control and push to a remote origin. And rsync or tarball your home directory and any other important directories(whole system if possible) and push it out somewhere, then and ONLY then should you feel semi-comfortable to start messing around with RAID settings/LVM/fdisk/ etc.