W D back up on windows 7 keeps failing?

Hi there just joined so please be patient!

I have backed up onto my wd passport 3 times and no problems, I was due for another back up after adding files to my laptop. I have tried three times but the back up fails near the end of the back up each time, is this a windows issue or is it a wd passport issue?

Sorry I think I have placed this question in the wrong topic area, could someone in the know please move it to the correct place, thank you!

This thread is the WD My Passport section, which may or may not be appropriate depending on the software you are using.

Are you using WD Backup, or are you using the built-in backup service within the Windows 7 Control Panel?

I back up to the passport through windows back up settings