The technology used to implement Time Machine is susceptible to network interruptions or sudden shut-down of a Mac. When this happens, Time Machine will need to repair the backup image. If it cannot do this successfully, it suggests to create a new backup. As long as there is space left Time Machine will not discard old data from the backup. When there is no space left on the backup share it will suggest to start deleting the oldest data in the backup to make room for new data. If you need the complete backup of all data ever on your Mac then contact our service desk to increase the size of the backup share.
afp://timemachine01.inf.ethz.ch/has "/" at the end. KeyChain. Start Migration Assistant.