I know this has been suggested before, I'm just posting this to let you know that there are many people who could benefit from such a feature.
I'm glad to see that it's on the to do list
Here are some suggestions I have if and when this feature is implemented:
- Delete unmatched files in target
- Compare by size/timestamp(/CRC? probably too slow via FTP)
- Generate que based on syncrhronization settings (don't execute synchronize)
Looking forward to the future possibility of this feature!