the disk space requirements vary on the following factors:
1) number and size of wiki pages
2) number and size of media files
3) number of changes on wiki pages and media files
To the plain size of these numbers come: search index size, meta information.
if your're using a lot of media files (images, pdf, videos, ...) this will be the biggest part on your hard drive.
Since DokuWiki supports media file revisions you also need space to store the old versions of this files.
Another tip on saving disk space is to delete old revisions of pages and media files. For more information just have a look at
our maintenance tips