Ive been running Pro Tools 11 off my SSD with only about 50gb free for awhile now (bad I know) and its seeming to tax my SSD a lot now. Im using Mavericks 10.9.5. I was told the best way to 'refresh' the ssd would be to delete everything and totally reset or upgrade my OSX from scratch then just keep some more space open. The thing is Ive had horrible experience when upgrading my OSx with apple. Everytime my devices have crapped out and stopped working has been directly after an upgrade, and everytime theyve blamed it on me. So considering my software all works fine with Mav 10.9.5 id rather just keep it on that version. So, I know if I wanted to upgrade I could just go into the APP store and upgrade, but how do I put my OSX through that process while STILL staying on 10.9.5? Also if I did decide to upgrade my osx how would I go to Yosemite instead of El Cap? Yos has been getting good reports with Pro Tools but El Cap hasnt been yet. I just have this bad feeling that if I upgrade from Mav my apples gonna crash considering its been showing signs of it lately and I simply cant afford to get pinned with another device dying after upgrade. Sorry, long multiple question thread- Cliffnotes of questions- 1.)How do upgrade from Mav 10.9.5 to Yos instead of El Cap? 2.)How do I refresh/clear/reset my SSD without actually upgrading and continuing to stay on MAvericks? 3.)Is this fear of upgrading my OSx irrational and everytime my device has messed up during upgrade its been a coincidence?