Are you facing Time Machine could not complete the backup error -1 on Mac? Well, it is a common corruption issue which is encountered while creating backup for important Mac files with Time Machine. Although, Time machine is an amazing backup utility for Mac users but at times it can malfunctions and result in severe issue. This very critical issue is one such unfortunate problem which can be quite nasty in case of data inaccessibility scenario. You can try Disk Utility in order to get rid of Time Machine could not complete the backup error -1. As it can repair some minor corruption issues on Mac hence it may fix this error problem as well. However, but if its fails then you will opt for a third party tool in order to rescue lost data on Mac. Mac Data Recovery Software would be best alternate for Time Machine. To get more info regarding Time Machine could not complete the backup error -1 visit: Mac fix help.