Find a File Service or Make OneDrive Work with Sync
WebDAV is a standard protocol for connecting to file services over the internet. You can mount WebDAV servers in the Finder just like a remote hard drive, upload and download files, or move things around. It's a solid standard and DEVONthink can use it for managing its sync stores, folders containing all the files needed for synchronizing one or more databases between multiple devices.
But what if you've just paid for a OneDrive plan? Or if you haven't signed up for an internet-based storage service at all yet?
Option 1: Sign Up for a File Service with WebDAV
For one you can sign up for a free or paid account, usually depending on your storage needs, at one of the many file service providers that offer also WebDAV access. Free Online Backup Services has a great list for you to choose from. And DEVONthink (To Go) has even a direct option for CloudMe because we've found it to be a fast and reliable service.
Option 2: Make OneDrive & Co. Talk WebDAV
If you already have a good storage plan but your service of choice doesn't support WebDAV then StorageMadeEasy's CloudDAV might be an option. You sign up for one of their solutions and connect your favorite service, e.g. OneDrive, Google Drive, or Amazon S3, to it. You can even "cloudify" your old-fashioned but reliable FTP server in your basement. Here's a long and complete list of services they support.
You might wonder why DEVONthink doesn't support other popular services. The answer is that there are simply too many services out there that all have their own, special way of connecting to them. So instead of wearing ourselves down with writing connection modules for each individual service we're focusing on improving our applications.