The cache folder is used to store resized images from your originals (in the /albums/ folder). You can clear it, but then your gallery will be slow as it re-sizes all the images when they're viewed for the first time.
It's important to have the cache folder so your gallery is viewable with the smaller image sizes and thumbnails. I recommend you don't empty it very often or at all.
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It's important to have the cache folder so your gallery is viewable with the smaller image sizes and thumbnails. I recommend you don't empty it very often or at all.