Do I need to keep all duplicate pluginappobj and others for future updates? 
Autor: Lasse A.
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WebSite X5 Pro generates a lot of files that are duplicated, most likely after each update of the site. Examples are files that end up in Prewiew, pluginAppObj and others. Can I just delete these or are they needed for future updates of the site?
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If you get in trouble with web space you could remove all files and do a complete upload.
I do this every few years but it's only needed if you realy need more space. The older files can be deleted. But will do no harm and won't make the website slower.
Make alwys sure you have a backup of your project and place that backup on a different drive then your standard one. This way you are always save.
Keeping te preview files makes x5 work faster.
Hope his helps,
BR Andre