My passport is empty but full!?

I’m trying to tranfer data from my old Mac new a new one (mainly music and photos) but having problems backing up my files! Ive have used my passport to back up my Mac before (with time machine) but when i tried this time it tells me there is not enough space on the drive. I have deleted everything i can see including old out of date back ups but it hasn’t increased my capacity! 

Thankyou in advance to anyone who can help me!! 

Remove the files from the Trash Bin as well … after that you will have the available space

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