Assuming Windows, Robocopy has a multithread option that might be able to do multiple copies simultaneously. Haven’t used it. Not sure. Free. Worth looking into.

In theory, it should work perfectly.

Some old, old drives had a problem where the spindle wouldn’t spin, a phenomenon known as “stiction.” Drives made in the last – maybe – 15 years seem to be immune.

One other remotely possible issue would be “bit rot.” That’s where the magnetic polarity of a single bit could change over time, often being influenced by neighboring bits.