Backing up External HD

[Armchair Expert]

Have an external hard drive I want to copy as it is old and got lots of photos on it, both are connected by USB, there is about 1TB of data and has been copying for about 40 hours and has copied just under 29% with 3 days to go, Any suggestions to speed it up

[Armchair Expert]

Thanks for advice, ended up copying in chunks onto hard drive of the computer then onto the USB device, lot quicker