WD Passort external drive will not backup

I am not sure why, but several days ago I started getting messages that Time Machine could not back up to “My Passport for Mac”. Does anyone have any thoughts on why that might be or what I can do to fix it?

Hi taridilks,

You should have a look at the link given below.

https://support.wdc.com/knowledgebase/answer.aspx?ID=9531&lang=en