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Moving from an internal media drive to a NAS
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At least get one more and set up a raid1 so each drive contains a copy of the data.
The downside is this limits your expandability as converting between raid levels is not easy and you don't get any additional space.
If you get 2 more drives you could go for a zfs1 or raid5 to get the extra space and a drive in case of a failure.
On a synology NAS you can use SHR-1 raid (which is basically raid 5) with just two disks. In pratice that acts like raid 1, but you can just add more drives and it will act like raid 5.
Not sure if other NAS have similar custom raids.