[Koha] storage space concern for Koha and requirements

Hi all, Very base (and possibly ignorant) question regarding the installation of Koha and its requirements (Linux, Apache, MySQL, Perl) from a beginner. For a collection of 9,000 materials, does anyone have a concept of how much computer space that would take up on a hard drive? Trying to evaluate how large of a backup will be needed once everything is in place. Thank you Caitlin McGurk Head Librarian The Center for Cartoon Studies mcgurk@cartoonstudies.org