If you rely heavily upon the time machine for you backup needs of your Mac then any failure can leave you frustrated. You may get the sparsebundle error 109 when you are trying to backup any lost data from the Mac drive. The Time machine is an automatic backup utility that save the backup copy of the every changes made in the Mac drive like creating, copying or modifying a file. The time machine saves the backup files in the external drive called time capsule, when the drive storage is full it starts deleting the files from backwards. So need to be careful and prioritize your backup. The sparsebundle error 109 shows up if there is any misconfiguration of the time machine preferences. You may also get this error if the time machine is unable to mount the external drive for backing up the data. You can fix this sparsebundle error 109 by resetting the configurations and mounting the drive again. If the backup still fails then you can recover the data by using the recovery tool that is Mac data recovery software. If scans the Mac drive by using its advance algorithm and then show the preview. You can select and restore the files you want and consult and professional to fix sparsebundle error 109.