I have snow leopard and i only want to upgrade my safari and email without loosing my data

You can't. Safari is part of OS X. so in order to upgrade it, you will have to upgrade OS X.

You should not post your email address here on this public forum where is can be harvested by scammers. I have requested that the Hosts edit it for your protection.

As an alternative to or primary application for browsing, if you haven't already, get & try Firefox.

It can be set as Default browser to the OS X, from within the Safari preferences; and it is current.

https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

There are add-ons and other features available through Mozilla site (access within browser) so

you can change some items and make it livable. I've almost always used at least two or more

browsers; in the past some of them were better suited for certain page site content.

With any browser, you'll need to practice 'safe browsing' techniques to avoid online troubles

however the security certificates and most other items should be relatively current in Firefox.

Good luck & happy computing! 🙂

If you are every worried about losing data it means you do not have a backup of your computer and someday you will lose everything.