There no backup required. Your content will remain exactly where it is now and there is a preview function when using the customizer.
The only themes we can use on WordPress.com hosted blogs are licensed and adapted to run on our multi user software the themes are found here http://wordpress.com/themes/ and in your Dashboard at > Appearance > Themes
Every theme has a detailed theme description page like this one is at https://wordpress.com/themes/motif/ That's where set up instructions for it are found. The live demo site is at https://motifdemo.wordpress.com/
All support docs are at https://en.support.wordpress.com/
re: switching themes
Note that switching themes https://en.support.wordpress.com/themes/#switch-themes can be easily done, provided you are logged in as Admin under the same username account that registered the site. Themes are just "skins" on WordPress.COM hosted blogs. You can quickly and easily change themes on any WordPress.COM hosted blog to another one found here http://wordpress.com/themes/ and no data will be lost or negatively affected by the change. The only time you may have to do a lot of work is if you are changing to a dramatically different theme with different features and/or if you have done any CSS editing.
Provided you are logged in as Admin under the same username account that registered the blog go to Dashboard > Appearance > Themes, Browse themes until you find one you like and click the "activate" or the "preview" link, or type in the name of the theme you want to use when it appears.
The theme customizer https://en.support.wordpress.com/customizer/ provides a preview function for exactly that purpose ie. so you can view what a theme will appear like prior to changing one.
Source:
changing wordpress theme
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