Time machine error 13 is a very critical one because it won't let you to restore the backup file that you have already lost from the Mac drive. The time machine is an inbuilt tool that automatically saves that copy of preferred file once configured. All the files are stored in the external drive that can be restored when required, however at times you may get the message such as Sparsebundle can not be accessed or the Sparsebundle is already in use which is commonly known as Time machine error 13. You must be thinking to fix this in order to get your files back, but this is not required now if you have any other source or backup. You can also use the recovery tool like the Mac data recovery software. The software has an advance algorithm that scans the Mac drive and retrieve all the files to show them in the preview. You can see each and every file of every format whether it is document or multimedia. You can select the files to recover and then after you can consult a professional for Time machine error 13 fix.