You can do two things:
- Save your folder pair as a location profile:
https://winscp.net/eng/docs/task_navigate#bookmarks
https://winscp.net/eng/docs/ui_locationprofile - or "save" your synchronization task in a form of a desktop shortcut or a batch file, using a
/synchronize
command-line switch:
https://winscp.net/eng/docs/commandline#synchronize