For your own protection, always keep a backup of your Skype contacts
Why should you do this?
Because your Skype account might be stolen. Maybe you think that this would never happen to you. We bet every model thing this way, even the ones who had this unpleasant surprise. And it’s better to be safe than sorry, especially since backing up your contact list is not rocket science.
Here’s what you need to do
1. Go to your Skype Window -> Contacts -> Advanced -> Backup Contacts to File