Please excuse me if this is a simple question but I am new to the world of Mac's, I have just bought a 2012 iMac and have come from being a longtime user of windows PC's. I have been using my new iMac for a few days now, on the first day I set time machine to backup to my NAS drive, the NAS drive is a 3tb mybook live. It has a time machine backup folder already on it so I backed up to that with no problems. For some unknown reason i had an error today while time machine tried to backup, is there an easy/proper way to remove the time machine backup file from my NAS drive so I can start a new backup from scratch? I can see no option anywhere in the time machine application to remove/reset backup. Thanks.