I just purchased a new 2TB drive to replace the original 250GB drive in my iMac. I was able to install the blank drive in the iMac and installed the original 250GB drive into an external case and have it connected via USB and have already cloned the drive using disk utility (very easy I may add). If i wanted to use Time Capsule, are its backups actual mirror copies of the source drive? Is the OS actually installed on it too (bootable) or is is simply just copies of files that are backed up. If I ever needed to restore the files, will I need to have Mavericks installed on the drive im restoring or will the backups already contain the full disk image, OS included. Also, the 250GB drive is a full installation of Mavericks and all my files and is still fully bootable. Do I need to wipe it clean first or need to leave the OS on it for the backup, or does it not matter.