Well I goofed, damn Yosemite worked perfect on my late 13 rMPB but I forgot all about my Apricorn Velocity 2 card and Cal Digit USB3 / eSATA cards on my 5,1 Mac Pro they are not working correctly at the moment. I need to do a control hold boot or I get a ? mark and the Cal Digit card is totally dead. So my dilemma is this, my last backup was via my time capsule, I can not boot from that nor can I get that data onto another drive as it is a sparsebundle file. But, I do have a drive off site with a time machine backup from a week ago. What I am wondering is can I revert to that OS and then update it with the last time capsule backup? Its a shame really as Yosemite already is a more stable OS than craptastic Mavericks but I need this hardware to work as executed.