Late last week, the excellent social bookmarking service Ma.gnolia suffered a catastrophic system failure. Recovery efforts are still underway, but in the meantime, if you are a Pukka user, you can rest assured that your bookmark data is safe and sound. As of Pukka 1.7, Pukka automatically makes backups of all of your accounts in a format that can be reloaded into Ma.gnolia (or any other social bookmarking service with a similar API, for that matter).
To get to your backups, see Pukka's main menu for an item that opens the backup folder.
Pukka updates these backups every time it pulls a full copy of your bookmarks from the server, which can happen several times a day, depending upon use.
Our thoughts go out to Ma.gnolia as they work to recover their systems.