Is backup via PHPmyAdmin all the backup I need?

Version v150, no upgrade, fresh install, the modules installed are Advanced Shipper, TinyMCE, and Blank Sidebox, all installed via FTP. I've customized a few CSS things (mainly the width of the shop and the side columns).
I've also disabled a lot of the blocks that were in the side columns.
Yes I've looked in the FAQ/Tutorials and searched the forum and haven't found an answer.
I even ran a Google search of site:http://www.zen-cart.com/ for what I was looking for.

I am about to install Image Handler3 to my store, and the first step it says is:

"BACK UP your database & store."

Now I know how to backup the database... is there another backup needed for "the store"? I have looked through the Admin options and haven't found anything... what does the instruction mean?

See the text IN BOLD RED at the top of this FAQ article: https://www.zen-cart.com/tutorials/index.php?article=103

Ah ok so they just mean a copy of your FTP directory. I have a mirror of that already.