Sync with windows computer

[P. Echols]

My desktop runs 16.04 LTS, It has a large folder of work related
documents.  I have another computer running Wondows 10 that has the
same folder.  these have been kept in sync by my backup service,
SpiderOak One.  I like SpiderOak, but when it has the occasional
glitch, the synck can be delayed by hours or days.  Not good for
business!

I want to manually sync the folders, then share the folder so both are
using the same one.  I've done similar on multiple linux boxes.  The
sync was done by rsync over ssh.

Does anyone know of a way to do the same when a windows box is in the mix?