Disable autosaving of WordPress posts easily, without modifying system files
Why would you like to disable such a useful feature, as auto save?
1) Because it interrupts your work, 2) Because you have reasons to believe you are not in danger of losing your post, 3) Because you seldom preview your posts before publishing, 4) Because the developers of WordPress did not have the common sense to let you configure how frequent should autosave be…
To disable WordPress autosave manually you would alter some files, but then you changes would be lost at the next WordPress update!
Better add to your WordPress plugins this one that will keep doing the job nicely.