It's a software function, but there's a catch. In order to break the RAID-0 array, you'll lose ALL the data on both drives. You need to backup everything you need first.
Once the data is gone, it's going to be dependent on the specific RAID controller, but basically it's a configuration of the controller to turn off the RAID feature, then partitioning and formatting the drives normally.
Yes, I clone my RAID-0 array to a backup drive all the time, and I've restored it to the RAID-0 array several times for various reasons. If you're worried about losing the data, make at least TWO backups of critical data.
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