"We are moving to an OBR10 setup for a small business with aged SATA drives of 4-6 years . " To me that would suck. drives treated perfectally and having survived shipping, are fully reliable for 3-4 years , then you start guessing that it isnt about to EOL.
3-4 years of Spun Up time, or 10-12 years of 8 hour day stuff, that it standbyed ,parked or the computer isnt evven on all day