XF 1.5 How to upgrade Addons safely

#1
I've made a lot of customizations to a few addons including some templates of XenForo itself , so, I'm quite concerned when I have to upgrade them. What is the best practice to upgrade Addons and the core XenForo that let me able to easily roll the system back in case that I stuck on something. Is backup the database and all files enough for this?

Thanks.
 
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