Andrew wrote:

"So our primary worry — an update going wrong — will never have to do with a plugin. It’ll have to do with our failure to verify that files were fully copied over and properly in place. Incremental updates we introduced a few years ago (if you update from 3.7 to 3.7.1, WordPress only downloads changed files) already greatly improved the safety of updating to a minor release. "

Does WP save old versions of those files (eg. page.php.v3.7.backup or something like this)? Simple Machines Forum does it and I find it a good idea, it gives you opportunity to quickly see what was changed and quick way to revert. Can anyone confirm?

What is your opinion about this?