Best method to migrate OS disks for standalone node

Jan 2, 2021
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Currently have proxmox running as a single node on a Dell R730xd. I use the rear 2.5" drive bays above the PSUs for my OS disks. They are setup as a RAID 1 using the onboard RAID controller. I'm using spinning disks and they live right at their temp limit in those slots. I'm worried about longevity so would like to replace them with enterprise SSDs that have a much higher temperature rating.

I'd like to know thoughts on the easiest way to migrate the OS and VMs etc without a total rebuild. Also to add the remainder of my disks in my server are all ZFS. Is there a way to backup the OS and do a restore?