How to SAVE all sheet at once!!

i am having problems with spreadsheet it just seems its not saving the sheets sometimes! and its really tiring everytime i edit the sheets and then everything is just gone!
is there any way to implement a SAVE button?! i read in a post expalined how to change the code to send all data at once… but either i couldnt figure it well or its nt working! still i have problem with saving data in sheet. i would be grateful if you can help me out!