Datasync channels

[tobmaster]

In an offline app I might want to store data that is bigger than a small key/value object.
For example large images, videoclips, documents.
It would be nice to be able to flag the data if it should be synced always or only when Wi-Fi is available. As tethering is very are common nowadays it might be also smart to let the user decide if large data should be synced currently or not.
An idea to implement such is to have documents of the same type which will be synched to the same remote, but locally are in separate databases (lets call them channels). e.g. One for large data and one for small.