Year and a half taught us that WordPress security shouldn't be dismissed by any means. Between 15% and 20% of the world's high traffic websites are powered by WordPress. The fact it is an Open Source platform and everyone has access to its Source Code makes it a prey for hackers.
Cloning your site is just another level in how to fix hacked wordpress which can be very useful. Cloning simply means that you have backed up your site to a completely different place, (offline, as in a folder, so as to not have SEO problems) where you can access it at a moment's notice if necessary.
Is also important. You want to backup all the database and files you can bring your site back like nothing.
Maintain control of your assets that are online - Nothing is worse than having your livelihood in visite site someone else's hands. Why take chances with something as important as your site?
You may extend the plugin features with premium plugins like: Amazon S3 plugin, Members only plugin, DropShop etc.. I think you can use it for free and this plugin is a fantastic choice.
You do consider needing security, when your website is new but you do have to protect yourself and your investment. Having a site go down and not having the ability to restore it may mean a loss of customers who won't remember to look for your site again later and more helpful hints can not find you. Do not let this happen to you. Back up your site after you get it started, as the site is operational and schedule frequent backups for as long. This way, you'll have WordPress security and peace of mind.