Time machine not backing up
Hi I have just got a WD passport hard drive
I recently had a Seagate one and it was having the same issues at this so I returned it but now I’m thinking it’s my Mac. I’ve tried doing the first aid thing and there are no errors. This is what is coming up when I try to back up my Mac to the hard drive. I’m not the best with technology so I’ve attached as much info as I can.
MacBook Pro 13″, macOS 10.14