I used GoodSync in the past, before I got a recommendation for FreeSync and I love it. During Windows times used it for every kiond of data backup, syncing, ... system images were the only thing I relied on Windows internal function.
Now, after changing to the Apple universe time machine is doing the bread and butter work comfortably in the background, but I still use Free Sync (it's cross-platform) for various archiving and syncing jobs for data I don't keep on my internal SSD anymore because there is relatively little traffic (e.g. client data archives, offline media archive,...) and thus has to be stored on mutiple devices (cf. 3-2-1 rule)
Free Sync is free, very flexible and very reliable, so I prefer to donate to the author from time to time rather than paying commercial license fees.
I am using it for about 10 years now and never had a single issue neither with my private nor - also pretty important - with my professional data.
It also supports cloud integration, but I haven't used it, so I can't say much about it yet.