I have my identities since like 15 years or so by carefully storing and saving them when reinstalling and since last week where I got an email to login into teamspeak.com it deleted all my favorites and identites when I started my PC the day after.

How is this possible?
How can I get back my favs and identites?
How can I disallow teamspeak to delete files from my pc without me explicitely prompting
(since apparently ts cannot be trusted any more?
Where are these files stored how are they named so I can configure sheduled backup tasks for these files!