You have lost data from your Mac and when you try to restore it using Time machine the backup was not performed because an error time machine. Even if you are using the an advance machine such as Mac there are possibilities that you can lost data on it. Sometimes you delete it in hurry, format the drive or have error while partitioning the drive and also while transferring the file. Other reasons are virus infection and OS X corruption, The Apple has provided the solution for backup on which you can rely but not completely as you may face trouble when the backup was not performed because an error time machine. When the time machine fails to provide the backup you must try other alternatives like iCloud or any personal backup you have created. If none of the backup facility works then you can use Mac data recovery software to restore all the lost data in the Mac system. The software scans the drive for the deleted data and show the preview so that you can select the required files and save them in desired location. You do not have to worry about the backup was not performed because an error time machine if you have this software installed in your Mac.