SyncToy 2.1 is a free application that synchronizes files and folders between locations. Typical uses include sharing files, such as photos, with other computers and creating backup copies of files and folders.
usual setting
*”Echo mode”(New, changed, renamed and removed on the left folder sync to right)
*include no system folder to sync targets.(It's never sure..)
*check backup results before running with “Preview” mode.
I never use “Timemachine”, so I can't compare, but I think this is simple and powerful tool.