I have about 6 items I'd purchased last night off Runtime DNA from their Real Deal but it was too late to tackle it last night.   As a rule I try to install all content as I purchase or download it.  If I find a site with many free items I try to install them over a few days.    I think my entire collection is between 20 & 30 gigabytes currently.  I have it subdivided into different runtime libraries.  I back up all installation files and runtime libraries in case of computer meltdown.