any one konw how to save big data not use localstorage thx

i try to save xml or csv ,but i don,t know how to save to file, i use ajax to save to php server but some time i need make Single game with big data thx

i want make a big game with 1000hero and infinite map ，i need Automatic creat map ，and one map had one data，infinite map had infinite data

use calljs????can do this???