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No. Raid 1 means that all data are written out to both disks. So you use both disks but only have the storage capacity of one.
I think the cheapest and best is @host_c , but I can't tell you about Windows because I hardly use it but which OS to back up shouldn't matter anyway.
Raid vs Backup
Raid is about not loosing data due to a drive failure. Backup is about not loosing data, no matter the cause or reason
As one potential reason happens to be that even whole data-centers may go up in flames (e.g. OVH "data center") or an earthquake may damage a whole region, it is strongly advisable to have backups stored a certain distance away; something like 200 miles or 300 km is commonly considered a reasonable minimum.
Disk one is not a backup of disc 2, they're both mirroring each other, as I stated above, if you have file Corruptions on one of the disk, you're going to have file Corruptions on the other disk, raid is not a freaking backup in any way shape or form.
Raids purpose is so you can recover from a hard drive system failure,
can i raid your disk sir
You make a confusion between file level and block level.
If you have a corrupted file that is written, via the SW/HW controller to disks, sure, it will replicate corrupted.
But if an issue arise from a corrupted block/sector on Disk1, it will not occur on Disk2 too. Disk failures are independent and do not replicate via SW/HW RAID controller.
Conclusion
either RAID 10 or nothing.
backup always necessary.
RAID is when your disk is about to fail and you sneak into someone else's house and steal theirs to replace yours with.