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RAID used to be a thing but not so much any more. Generally speaking it can be far more trouble than it's worth. Definitely NOT hardware raid, as you are trapped in the proprietary format hell. Unless you keep extra copes of the hardware your data is toast if there's a hardware problem down the line.
If you're after data integrity then do scheduled backups, at whatever frequency suits you, to external (several rotated, ideally) usb drives, plus NAS if you want a live local copy, plus off site if the data really matters.
If you're after speed use SATA SSD or better NVME SSDs. If you must raid them for the extra speed only use it for scratch and do very frequent [hot] backups.
Way overkill for astro, more for enterprise databases etc.
I use NVME for processing then move the data to a local HD. Then it's schedule copied to NAS for archive. Any important stuff is also copied to ext USB in the schedule.
Every year I replace my "work" drive with all my code (not astro) and stuff on and make a copy to the new drive. I label the old one and put it on the shelf. Not a fireproof solution, literally, but it's ok.
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