Never ending backup

Thanks in advance…just bought ‘my passport for Mac 2tb’ to back up my iMac os Yosemite via time machine. The back up seems never ending, as it gets closer to the end of the back up, the amount to back up just keeps increasing! Any suggestions please?

Welcome to the Community.

There are times when Time Machine does not completely calculate the total number of files to copy. As long as you do not notice duplicate files and/or an abnormally large disk space being taken by Time Machine then the application should be working fine.

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