Read perf would be the same or better if you didn’t add redundancy
RAID 1 can absolutely be faster than a single disk for read perf, and on Linux it is tuned to be faster. It’s not why you’d use it, but it is a feature of RAID. Intuitively, since both disks have exactly the same data, each disk could read different things. Likewise, for writes, you don’t have to write at the same time, as long as they’re always correct (e.g. don’t flip the metadata segment until both have written the data), so you can even get a write boost.
If performance is all you care about, then yeah, go ahead and use RAID 0. But you do get a performance boost with mirroring as well.
Yes, a backup should be tested, but it shouldn’t be relied on. Internet can go down, services can have maintenance, etc, so it’s a lot better to never need it. If you can afford a mirror, it’s having.
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