I continue to use ROADKIL'S UNSTOPPABLE COPIER to sync what I want to where I want. It has many options and is not proprietary in any way.
I do not trust the Cloud! I would like to back-up my data-files from the HD of my laptop to an external HD (Seagate, I think). I do not have that many files to back-up, i.e., not many photos. Please recommend a software that I should purchase for local back-up.