Mylio Photos+ protects your media from loss or device failure using features such as secure syncing and redundant Vault devices.
Mylio Photos connects all your devices and authorizes each to see your entire library.
Mylio Photos adds the catalog to each device. This lets you browse photos without the cloud (or even an internet connection). This catalog is very small and fits on almost any drive.
Original files are kept on their original device by default. Additional copies are made on your Vault devices thus creating redundancy for your entire library.