Hi everyone, So I asked a similar question before, but I worded it very badly. This is my situation in a nutshell. I backed up two internal drives with Time Machine on an external drive. I then cloned my startup drive to upgrade to Yosemite. I no longer need to backup my old drive that I cloned from. Is there any way to replace the backup of my old drive with my new drive? Right now it says that if I want to backup my new drive as well, it wont exclude the old one, it will just keep that backup and I do not need it anymore. Just looking for a way to do this without having to back up both drives again (It took 26 hours!) Thanks!