If you really want/need the full history of your repository, you'll have to either get a dumpfile from the provider or get it yourself - some of the responses so far have addressed this already.
Another option: if you are not concerned with past revisions, but want your repo at it's latest state, just checkout the head revision, and export it to a separate location on your computer. That way, you have all your work to this point. You could then keep that as a backup, or possibly create an SVN account elsewhere, and import the exported copy into a fresh repo, then you would be back in business.