Time machine doesn't allow the external hard disk to make a back up copy
How can I get Time Machine to make backup copies again?
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How can I get Time Machine to make backup copies again?
How to setup and use Time Machine: Back up your Mac with Time Machine - Apple Support
I suggest you start from scratch and do all steps required, don't skip any.
Other than that, you need to provide more detail for a more comprehensive answer: https://discussions.apple.com/docs/DOC-5931
How to setup and use Time Machine: Back up your Mac with Time Machine - Apple Support
I suggest you start from scratch and do all steps required, don't skip any.
Other than that, you need to provide more detail for a more comprehensive answer: https://discussions.apple.com/docs/DOC-5931
What have you done since you last got a successful backup?
What exactly happens when you try to backup? I do you know it failed? Any error message?
Time machine doesn't allow the external hard disk to make a back up copy