* I built my server class machine at home..........I use a LSI Hardware Raid Controller. I also have one of them as a backup controller, still in the box. It has updated bios, and drivers IN the box for Linux, Centos, Windows 7, 8, 10....Just in case.
* Hardware Raid 5 with 5 500gb solid state Samsung 840's.
* Hardware Raid 5 simply because it is FAST, and using HW controller, means if I lose the motherboard, I'm not losing the raid, and I can also dual boot linux or windows or windows 10, or bootable thumbdrive centos, etc, etc, etc, and still see the raid controller. REALLY important for me.

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* Backed up to Raid 0 on another box.
* I should tell you about my software raid 5 array of thumbdrives.....that was fun

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* Redundancy doesn't keep me up at night. But I know I will not lose stuff I've been keeping for 10-20 years.

. Digital Pics, Videos, etc, etc.
Hey, I'm a DBA, I live and breathe backups

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Later,
geo