One thing I forgot to mention: rsync has an option to preserve file timestamps, so if that’s important for your files, then thst might also be useful… without checking, the other commands probably have that feature, but I don’t recall at the moment.

rsync -Prvt <source> <destination> might be something to try, leave for a minute, stop and retry … that’ll prove it’s all working.

Oh… and make sure you get the source and destination paths correct with a trailing / (or not), otherwise you’ll get all your files copied to an extra subfolder (or not)