My IMac is running Snow Leopard however my mbp is running Mavericks (I just installed it directly over M) and I would like to start sharing calendar info and reminders across all my devises via iCloud. So, I downloaded Mavericks to my iMac and attempted to create a bootable thumb drive. However, when I go to system preferences to select the startup disk the thumb drive is not visible, only the iMac hard drive and my OWS Mercury drive (used for Carbon Copy Cloner backups) are available. So, my question is, could I just let CCC run it's normally scheduled backup to the OWS drive tomorrow night and then after verifying it still boots up, wipe the iMac hard drive and run the installation from the OWC drive and just forget about using the thumb drive? Thank you for your help.