I'd like to use a hosted issue-tracking service, but I want to be able to backup my data in case the service goes under.
Are there any hosted issue-tracking services that have a "data liberation" strategy and support you periodically copying your issue-tracking data to your local system?
If not, does anyone have a clever workaround for backing up your data using an existing hosted issue-tracking service, even if it's in an unsupported way?