It keep fails midway. i found a pretty need solution provided by MS in every PC. Below are the syntax i wrote in the cmd
Robocopy "C:\UserFolder" "C:\FolderBackup" /e /Z /log+: logcopy.txt
first syntax is source address
second is destination
/e is for copy all contents including empty directories of SourceFolder to DestinationFolder:
/Z is to re-do/continue on error/network fails
last one is log location.