Here is a quick tip for anyone (web developer or non-techie) just starting an eCommerce website built on web based applications. It is a basic rule that you should follow to avoid breaking your website when updating the code of a Netsuite web store theme.
Ecommerce applications like Netsuite, Volusion and even Yahoo stores have text area form fields in their apps to enter HTML/JS code for the templates. Because these input fields are very small, it is very easy to delete or change this code. I was asked to fix this unintentional problem several times, but it could have been avoided. The solution is simple, copy all the code out of the text area fields and into .html files every time. Then you have a backup of this files, plus edit them using a WYSIWYG like Dreamweaver or a text editor.
Here is an example of an item template from a Netsuite web store theme. The code is moved from the text area field into a txt file. Simple, until you forget to do it.

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