Syncing to local file system

Syncing to local file system

I have a paid zoho account but have a few thousand documents and spreadsheet files on my linux and and windows computers. I would like to be able to sync these to my zoho documents. So far I can find no way to do this.  I tried the zip file and individual file route but that will take me days of work and not provide real synchronicity. I am sure this is a common, if not universal request and I am missing something. Does anyone know how to sync docs on Zoho?