Understanding Telegram's Data Storage

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Telegram's design is heavily reliant on cloud storage. This means:

Cloud History: Most of your chat history, including messages, photos, videos, and files (except Secret Chats), is stored on Telegram's servers. This is why you can log in to your account on a new device and immediately see all your past conversations.
Local Cache: Your device (e.g., iPhone, Android phone, desktop) stores a temporary cache of recent chats and downloaded media to improve performance and allow some offline access. This local cache takes up storage space on your device but is essentially a copy of data that primarily resides in the cloud.

Secret Chats: These are a unique feature of Telegram, offering telegram data end-to-end encryption. They are strictly device-specific and are not stored in the cloud. This means they cannot be transferred between devices and are permanently lost if the device they were created on is lost, wiped, or the Telegram app is uninstalled.

When you aim to "delete all Telegram data," you need to consider whether you want to clear data from just your device, remove specific content from the cloud, or permanently delete your entire Telegram account.

Part 1: Deleting Local Telegram Data (on a Specific Device)
This set of actions focuses on freeing up storage space on your phone or computer. It does not affect your data in Telegram's cloud or on any other devices where you might be logged in.

1.1 Clearing Telegram Cache (Recommended for Space Saving)
This is the safest and most common method to free up significant space without losing your chat history. It removes downloaded media, temporary files, and other cached data.