All data is stored heavily encrypted and the encryption keys in each case are stored in several other DCs in different jurisdictions.
Telegram only stores the data it needs to function properly — for as long as you want Telegram to function. We store messages, photos, videos and documents from your on our servers, so that you can access your data from any of your devices anytime and use our instant server search to quickly access your messages from waaay back.
Messages in Secret Chats can be ordered to self-destruct.
If you would like to delete your account, you can do this on the deactivation page.
Deleting your account permanently removes all your messages, groups and contacts. We never delete your funny cat pictures, we love them too much.
For the same reasons secret chats are not available in the cloud — you can only access those messages from the device they were sent .
When you send photos, videos or files via secret chats, before being uploaded each item is encrypted with a separate key, not known to the server.
The entire game can be played without making a purchase.