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For once, a site that recognizes the importance of third-party backups! They have a main downloads page from which you can get XML dumps from individual wikis.
There's an old article dump (2008/03/12) up on the pirate bay, from the archiveteam TPB account. Also, a dump from 2006.
Some Wikipedia dumps in Internet Archive.
There is no current public backup for images uploaded to Wikimedia Commons which has about 7 millions of images.