Overwrite global file exists rules - If you want to specify special file exists rules for this site,  you must check this option,  otherwise the global file exists rules will be used for this site.

Server to local - Rules for transferring a file from server to local where the file already exists

Local to server - Rules for transferring a file from local to server where the file already exists

Server to local - Rules for transferring a file from server to local where the file already exists