Android storing data online -

i have ~5k active users own small app. thought app needs user favourites etc. saving data on online. , maybe add user login screen facebook or google+ when saving data.

that's why use parse, amazon? 1 easy use?

http://docs.amazonwebservices.com/amazonsimpledb/latest/developerguide/welcome.html

https://parse.com/

i have own 5gb bandwidth web server can do? i'm new in php language , maybe security problems? or should use json?

what suggest how do?

the best known app use own api. best solution build little api in server.