I back up my blogs frequently using a free plugin WP DB Backup. I will always restore my blog to the last settings if anything happens. I use WP Security Scan read more plugin to scan my site frequently and asks that are suspicious-looking to be blocked by WordPress Firewall to fix hacked wordpress.
Don't depend on your internet host - Many people depend on their web host to"do all that technical stuff for me", not realizing that sometimesthey do not! Far better to have the responsibility lie rather than out of your control.
Keep control of your assets - Nothing is worse than having your livelihood in the hands of someone else. Why take chances with something as important as your site?
You can even get an SSL Encyption Security to your WordPress blogs. The SSL Security makes secure and encrypted communications with More Help your site. You can keep the all of the cookies and history of communication so that all transactions are listed. Make sure all your sites get SSL security for maximum protection from hackers.
Of course you can set up more plugins to make your shop like automated backup plugin or share buttons. That's all. Your shop is up and running!