What to do when issue-tracker is down?

Question

It has happened in our team that our issue-tracker is down. Happens about once a week now (yes, wow), and there's not really much we can do to get it back up, since it's hosted by our client in a different timezone. It sometimes takes several hours for it to be operative again.

In the meanwhile, we can't really tell which issues we were working on, and in case we do, we cannot update those issues, as in moving them through the workflow, logging used hours, checking the issue's description, leaving comments, and so on.

So the question is: how can we, as a team, work in the meanwhile so that when the issue-tracker is up again, we have the least possible hassle updating it with what we've been working?