I believe that it would more than a day to clone a 10TB drive using any software product!
Yeah, once you get to that size better to just keep them in sync

If I save a file on replicated drive in location A it gets copied to another drive in location B
and Vice Versa (takes about 20 seconds usually)
of course, you need these size drives in both locations, but that's how we roll

Oh, and have a VPN between both locations and a secure subnet for best results
I'm sure this is way beyond most users needs, but this is what we do .. sometimes between continents