If somehow you are confronting Time machine could not complete the backup issue, you should take feasible measures resolving the problem ASAP. Since Time Machine is frequently used utility among users, therefore no everybody wants to access it smoothly. However on the flip side due to uncertain error message you would have to face inconvenience in Time machine disk. Time machine could not complete the backup is such an error which does not let you to access backup as well as inhibits creating further backup too. Hence it is quite prominent to overcome from this error. Using disk utility for resolving the problem can be taken into account. Alternatively mounting and unmounting disk is being used. But when these measures failed then reinstalling time machine needs to be taken to resolve Time machine could not complete the backup. And at meanwhile data can be restored easily with Mac Data Recovery Software. This is an awesome tool for retrieving data no matter how its has became inaccessible. Moreover it makes the recovery of voluminous amount of data in quicker way. Thus by this incredible solution you no longer have to worry about missing data. So resolving Time machine could not complete the backup error is straightforward.