The hosts file is a computer file used by Windows operating system to map hostnames to IP addresses. The hosts file is a plain text file, and is conventionally named hosts.
Emails are became very important, more than backing up documents. If you’re are a Gmail’s user I found this backup tool that let you backup and restore your emails.
Gmail Backup is aimed to backup and restore of your GMail mailbox. You will need to activate the IMAP access to your mailbox, to do so, please open your GMail settings and under POP/IMAP tab activate this option.
Ditto is a tool that every windows users should have. It is an extension to the standard windows clipboard. It saves each item placed on the clipboard allowing you access to any of those items later. Ditto allows you to save any type of information that can be put on the clipboard, text, images, html and other. You can configure a keyboard shortcut that opens a window with all the things copied.