Site administrators have the ability to backup the content of their WordPress blog to transfer to new locations in the future, or to prevent a loss of information should something happen to the site.
To back up your content, log into the desired site and click into the dashboard.
Choose Tools > Export
Choose what content to export. In most cases you will want to export All content. However, if not all content needs to be backed up, individually choose the content that does.
Click Download Export File at the bottom of the page.
Place your newly saved backup file somewhere safe and your content backup is complete.