How do I copy Photos from one external hard drive to another external hard drive?

1. I am trying to copy Photos from one external hard drive to another. I can't do so. The copying process almost completes when a notificatioin pops up telling me the operation can't be completed because there is already a Photos folder, or words to that effect. I have done this before successfully. There is plenty of space on the hard drive I'm copying to. I hope someone can help me with this.

2. I am also trying to delete my Time Machine backups from one external hard drive. I tried dumping the Backups folder into the trash and deleting it. This doesn't seem to work. The trash won't empty. Any suggestions will be gratefully accepted.

Thanks for looking... 😕