Hello ~
Well, the complexity of this depends on how is your "localhost" app built, as well as the "server" one, as well as how do you want this update to be done. Is it just information from your database? (So, maybe want it to be written/replaced directly on the server database?) Do you have APIs on both sides, so there could be a "bridge" app that queries the local app and push the info into the server app?.
Would be good to discuss this a bit furter, before making any final decision ~