you might wanna check how many 6bgps ports you have. My z68 sli only has 2 so that's why i only went w/ 2 ssds in raid 0, the other 2 are 3gbps. I run a nightly image backup to my 2tb hdd. So if one of my ssd's ever fail, i just need to replace it and restore the last image. I get pretty close to double the speed w/ raid 0 vs 1 ssd. At this point, I'm pretty confident my ssds will outlive my system before I upgrade (in the next few years). Sandisk and other manufacturers offer software utilities to monitor disk health. You could get a dedicated raid card if you wanted to expand.
i7-3770k @ 4.5Ghz 1.35vMOBO:
EVGA z68 SLIRAM:
16gb Corsair Vengeance DDR3 @ 2000Mhz 11-12-11-31 1.65vGPU:
SLI 2x EVGA GTX 1070 SC 8gb GDDR5 Core @ 2050Mhz Mem @ 4500MhzSTORAGE:
Raid 0 2x SanDisk 256gb x300s SSDDISPLAY:
Dell S2716DGR 27" LED 1ms 144mhz 2560x1440PSU:
Antec TruePower 650w