Rsync wasn't helpful in my case. It refused to recognize file names
properly, complaining about charset encoding, not even with --iconv
parameters.
Probably because of locale differences between my system and mounted
filesystems and who knows what else.
Difficult to say without knowing more details. Are those "directories"
actually on different file systems?
For vfat, specifically, there is a codepage argument for mount.
Cheers
I've tried to mount filesystems (all NTFS) with different locale
parameters, still ended up with either garbled filenames or charset
conversion and 'path too long' complains from rsync.