In some of them you can choose the period of time. For example Dust erases everything in 24 hours.So they delete everything automatically or I can set it somehow if I don't want some messages to be deleted?
It's a very useful thing but I still want to save some conversations.
Telegram stores everything! I can tell you more - the developers have an access to all the information.So Telegram also erases the story by itself? I thought that it stores it on a server.