Your condescension is matched only by your reading comprehension. I do not know what your requirements are. You said coding and alluded versioning, so I tossed out git. Enjoy your tech debt. I hope it serves you well and supports your ego for many years.

Versioning is a feature completely separate from raid or dual nas or whatever else you do. Your example of the house burning down is exactly why I questioned the dual nas… Both nas will be toast.

So please, tell me again why you need 2 nas for versioning? Maybe you’re doing some goofy hack, then ok. That’s still silly. Just do proper versioning. If you’re coding, just use git. Don’t reinvent the wheel.

On site? I put enterprise drives in my nas. Always have and have never had a drive fail. If one does, raid is good until the replacement arrives.

Local to synology. Synology to AWS with synology’s backup app. It costs me pennies per day.