When I was in college, one of my company instructors told us students that one of the biggest hurdles to making money was procrastination.
If you do not have good protection on your site, files can easily get lost. Some of those files may be stored on your computer and easily replaceable, but what about the rest of them? Where are you going to get them from again, if you lose the first time to them? Especially fix malware problems free is vital. Long-term sites have a good deal of data and have made a number of files. Recreating that all would be a nightmare, and not something any business owner would like to do.
The one I recommend, and the more powerful approach, is to use one of the creation and storage plugins available for your browser. RoboForm is liked by many people, but I believe after a trial period, you have to pay for it. I use find here the free version of Lastpass, and I recommend it for those who use Firefox or Internet Explorer. That will generate secure passwords for you; you then use one master password to log in.
Maintain control of your assets that are online - Nothing is worse than having your livelihood in the hands of somebody else. Why take chances with something as important as your site?
You can also create a firewall that blocks hackers. From coming into your own files, the firewall prevents the hacker. You also have to have version of useful link Apache. Upgrade your PHP as well. It's essential that your system is filled with upgrades.
Just make sure you decide on a plugin that's up to date with release and the version of WordPress, and that you can schedule, restore and clone.