I have had two WordPress blogs hacked into in the past. That was at a time when I was doing very little internet marketing, and until I found time to address the situation (months later), these sites were penalised in the search engines. They were not removed, but the rankings were reduced.
I back up my blogs regularly using a plugin WP DB Backup. I can restore my blog if anything happens. I use my site to be scanned by WP Security Scan plugin that is free regularly and asks that are suspicious-looking to be blocked by WordPress Firewall to fix wordpress malware cleanup.
Everything you've worked for will proceed with it, should the server of your site go down. You'll make no sales, get signups or no traffic to your website, and in short, you are out of business until you have the website.
A snap to move - If, for some reason, you need to relocate your site, such as a domain name change look at this site or a new web host, my latest blog post having your files at your fingertips can save you oodles of time, hassle, and the need for tech help.
If you aren't running the latest version of WordPress, upgrade. Like keeping your door unlocked when you leave for vacation leaving your website in an old version is.
Of course you can install plugins to make your store like backup more helpful hints plugin or share buttons. That's all. Your shop is now up and running!