I noticed yesterday, 31 March 2014, when I run my batch command below, it downloaded all the files again. Perhaps, the document's timestamps were shifted because of Daylight Saving Time? What is the solution or command to avoid downloading all the files?
option batch continue option confirm off option reconnecttime 2 open ftp://.... option transfer automatic synchronize -mirror local "C:\doccuments" "/server/documents" close exit
I'm using Winscp552.