Definitely,it pertinent to secured one's site from being hacked,I know most times bloggers and site owners feel reluctant to secured their sites because they believe it doesn't matter or hackers can't hack the site but we can never tell,so good or bad we need to buckle up.
Some measures to be taken includes adding an SSLto one's site, this is security socket layer where one have secured connection on the site, so that no body can get into one's content.
Try to guard against attacks by installing softwares that can mitigate agsnist DDOS attack which could even bring down one site.
Create a very strong password for the admin login,so that it will be difficult for hackers to guess and use aganist the site
It pertinent not to store the site details online.Storing it away offline might be better.