These rsync options are useful to sync with an ExFAT drive:

rsync -vrltD --progress --stats /source/a/ /dest/a

-vrltD

options from -a friendly with EXFAT.

The standard rsync options like:

rsync -a

don’t work with an EXFAT drive because EXFAT doesn’t understand permissions, owners, or groups.

rsync: mkstemp … failed: Function not implemented (38)

Per-file progress:

rsync -av --progress

Overall progress:

rsync -a --info=progress2