The bug (well not really but it could be a problem for some).
When creating a back-up from a website (lets say domain-a.com), and placing it on a different domain (say damain-b.com). The configuration.php has the wrong tmp folder stated. By this reason, installing a component does not work on your new domain.
What would be nice.
We would love to see the possibility to schedule a back-up weekly (maybe using cronjobs).