PHP5, SQL database and web host server

Question

1. what configurations can make differ between a local host server like phpMyadmin and a web hosting server
2. is it possible or convenient if a laptop [instead a desktop computer] is converted into a serverHost
3. is there a php script provided for an automatic backup or sync of files
4. in a web-based application, which is better? running the codes first in the localhost or directly upload the codes in the webhost ??

waaa .. .i need some response to this

Answer 1

1. Default configurations on localhost servers are almost the same as the configurations hosting-companies offer.
2. Ofcourse!
3. Just google, back-up is always possible.. hosting-companies gives 90% of the time a tool in the controlpanel to backup your website.
4. Always test on localhost then apply on the webserver and watch the results.