OK… I am happy to give you a complete updated for those that are not following;
After months of battling Drop Box (you can imagine the frustration) I have been trying to find an alternative. So my initial plan was to use a VPN to get back to one of the Macs in the office that can act as the host, but getting Bonjour to work over VPN is a pain.
So next plan - Use the Synology NAS to host a Webdav server. That failed, as for whatever reason DT would simply not work. The server was fine, and I could see the share in a browser, but DT was having none of it.
So next plan - Run a Webdav Server on a Mac in the office. That plan started out rough, as DT kept timing out, and then once the DB was down, it appears to want to upload the entire contents again, and the kept timing out.
So I scrapped it, and started again, and let it run overnight. This morning it appears to have synced the DB, although a LOT of time out errors, so I am not sure how that is going to pan out.
Time will tell. Today will show whether this plan is going to work or not I guess.