WinRAR and compression enquiry/issue

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http://serverfault.com – I've got a large disk (500GB) but am deciding to free up space - got 249GB left, so that's 49.8% of the disk left, if my calculations are right. I'm planning on install of Adobe Photoshop and (possibly) graphic design apps, so have decided to free up some space. I also have a local WAMP install for testing too. Also stored are some films - around 3-4GB, saved from DVB-TV install. Using WinRAR I plan to compress the original folders, which are named: HTML backups (my original HTML files that I made for testing purposes - that's over 2 GB) Public domain images (mainly JPEGs, some GIF and PN (HowTos)