I am trying to back up my iMac 10.7.5 with the Time Capsule we've been using for ages. I get this error message: This backup is too large for the backup disk. The backup requires 755.82 GB but only 435.88 GB are available. Time Machine needs work space on the backup disk, in addition to the space required to store backups. Open Time Machine preferences to select a larger backup disk or make the backup smaller by excluding files. A few months ago we had a new hard drive put in and did a complete reinstall from this time capsule. After that, it started to get buggy. I made a complete backup through Time Machine onto a new external drive yesterday. Should I just empty the Time Capsule and start fresh on it? The last update was in May, 2013. If so, how do I empty it? If not, what are my other options?