The setting for establishing and enforcing a quota for file storage will be set at the module level, not at the DNN / Portal level. It depends on the module used.
There seem to be too many choices for a DNN module that will allow your users to upload various files to their own folder. However, I found one that has two positive reviews that, if it works as promised, should meet your requirements.
http://www.snowcovered.com/snowcovered2/Default.aspx?tabid=242&PackageID=16691
According to the author, it allows you to provide users with their own directory to which they can be downloaded.
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