The My Cloud is a network attached storage device (with additional features included). Generally, without potentially voiding the unit’s warrantee, it does not retrieve data from remote or other network devices outside of the Safepoint/Backup retrieval option. If you have not already done so you may want to read the My Cloud User Manual (http://www.wdc.com/wdproducts/library/?id=439&type=25) which explains what the device is capable of.
You should check the user manual for the camera to determine what features it has and if it is capable of saving/streaming data from the camera to a network attached storage device or to an FTP server.
There may be ways to use SSH to instruct the My Cloud to initiate a remote copy (using a Linux command like “rsync” or similar) from the camera to the My Cloud, but that is not something officially supported.