You can set number of days to only delete data older than this setting (but not for cache, it gets cleared totally).
			
			Data consistency
- regenerate friendly URL’s for products (for all languages)
- regenerate friendly URL’s for categories
- regenerate friendly URL’s for CMS pages
- set products’ cheapest combinations as default
- set products’ first in stock combination as default
- assign the most common tax rules group to products with incorrect (none or deleted) tax rules group
- reset meta titles for products – new feature
- reset meta titles for categories – new feature
Fix images
- delete products’ broken images (the ones that appear as question marks)
- delete unused image files (cleans all leftovers in the img/p/ folder along with empty folders)
- set first image as cover for products without cover
- associate all images to all shops (useful if you find some of your images not displaying)
- set product’s cover as it’s first image
- delete temporary images
- delete images from disabled products
- delete thumbnails from disabled products
- disable active products without images
Fix associations
- set product’s deepest category as default
- assign all products to parent categories (usefull if some products are assigned only to some deep categories, but you want them to appear also in parent categories)
- assign all customer groups to all categories
- associate all attribute groups with all shops
- associate all attributes with all shops
- associate all features with all shops
- associate all modules with all customer groups – new feature
