Trying to move backup file

Hello. I am replacing two laptops with one and am trying to move a backup file from one external drive to another external drive.

Size is about 500GB. What happens is that the progress window shows 5 seconds remaining then continues to increase the size of the transfer. It got to about 1.23 TB before I forced the finder to close.

Any idea what’s going on here? Backups were made in Sierra OS and new MacBook Pro is on High Sierra if that matters.

Thanks

 

I tried Carbon Copy and it won’t mess with Apple Backup files. The problem is I can only move Time Machine backups to the top level of a drive and I was trying to move it into a folder I made.

Got it worked out