Updates the item's old data with the new one as it is overwritten. (WARNING: This action may overwrite your old data with the new one. To prevent accidental overwrite implement a dialog box to warn users that they may be overwriting their data with new ones.
{"msg":"Cloud","action":"Update","Item":"foo","Data":"new bar"}

If the item exists, the old item will be replaced with the new data:
{"MSG":"CloudDataUpdated","Item":"foo","Data":"new bar"}

If the cloud space is too much for it to fit then the server will send and cancel adding the item:
{"MSG":"CloudSizeLimitReached"}

If the item doesn't exists then the server will cancel the update and send:
{"MSG":"CloudDataNotFound"}

If the cloud account doesn't exists:
{"MSG":"CloudAccountNotRegistered"}