First of all, what is CloudStation? Well I can try to explain but this is what Synology writes about Cloud Station;
Whether you are at home or outdoor, your PC always carries important files with the latest versions in a single folder. For that, Cloud Station does the work for you. It may looks like any other folder on your PC, but the Cloud Station folder is actually a private cloud that always prepares itself up-to-date. Cloud Station pushes files, songs, and photos to any PC that you are working on, and syncs automatically.
View and edit your files anytime you want via the Cloud Station folder even without the Internet connection. You can edit spreadsheets, create a new document, or upload photos all within the folder offline. After Internet access is resumed, all changes will be automatically synced onto Cloud Station and will be ready again for next offline viewing. Your files are made truly available.
A single Synology NAS is everyone's private cloud. Every user can own a Cloud Station folder on their own computers and enjoy all the benefits it has to offer. All clouds sit safe and sound in one DiskStation, where data security and privacy are guaranteed. In addition, when your PC and DiskStation are in the same local area network (LAN), you can also enjoy the speedier transfer rate than what’s offered over the Internet. Large file uploading and syncing just become faster.
So it's a kind of private implementation of DropBox to run on your own storage solution. Now we know what Cloud Station is and we're convinced we want to run this on our DiskStation we take a look on how to do this.
Install the Cloud Station package on your DS
First we have to install the Cloud Station package using the Package Center (found in the top menu). Click the available package tab and locate the Cloud Station package.
Click 'Install' to download and install the Cloud Station package.
Configure the Cloud Station
After the installation you can open the Cloud Station Manager from the top menu;
In the Cloud Station Manager you must first enable Cloud Station by ticking the checkbox in frond of 'Enable Cloud Station', then click 'Apply' to commit the change.
After that we can define witch users may use the Cloud Station services. On the Privileges section, check the users who should have permission to use Cloud Station. After you select them you have to click 'Save' on the top to apply the changes.
That's all we have to do on the DS side, now we have to configure the firewall with a NAT rule to forward incomming requests on port TCP/6690 to the Synology DS.
Configure your firewall
The Cloud Station client will communicate with the DS on port TCP/6690, so we have to create a NAT rule to forward this traffic. I've made a screenshot of my DD-WRT firewall NAT rule, this may differ from your setup.
With this rule in place we can continue with the installation of the Windows Cloud Station client.
Install the Windows Client
By the time writing this article there's only a client installer for Windows available. First you have to download the client from the Synology Download Center; http://ukdl.synology.com/download/ds/CloudStation/Synology-CloudStation-Setup-2197.exe
Run the setup and accept all defaults, after the setup the Configuration wizard will open;
Click 'Next' to start the configuration. In this screen you must fill in the public address of your Synology DS and provide your username and password (both are case-sensitive!).
In the next screen you must provide a name for this Windows client and select a folder witch Cloud Station will keep in sync.
That's it, the Cloud Station client will now keep the folders across your Windows stations in sync with your Synology DS. You can see the synchronization status by hoovering the tray icon;