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Sitefinity 3.5 was primarily a bug fix for Sitefinity 3.2, since over 30 issues were fixed with the 3.5 release
. Upgrading from 3.2 to 3.5 involves downloading the hotfix, replacing the files in the hotfix with the ones in your application and updating your Web.config accordingly. For more detailed instructions, please read this article
To backup your current set-up, rename the folders that need to be replaced in the hotfix. Also back up your database by opening up SQL Server Management Express, expanding the databases folder, right clicking on your database, go to tasks and then click on backup.
Feel free to contact us if you need further assistance.
the Telerik team
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