BobF
I used https://www.freefilesync.org/ without problems for a long time. The only reason I stopped is because Reflect does everything I want - no need for two tools.
That FreeFileSync looks exactly like what is needed. The automatic real-time sync is a plus. That way you always have the latest versions of your files in the backup folders.
Even if you take an image daily, as I do, this would be handy for document or project folders that may be updated during the day. The current day's changes would be lost by only relying on a daily image to restore.
At first glance, it seems to have the functionality of a Dropbox type service with real-time folder sync, but you are in complete control of where the backups are stored. Nice!