QQ's cloud sync is what lets your account follow you from device to device. Here is exactly what it covers, what it doesn't, and how to set it up correctly.
QQ's cloud sync keeps your account-level data — your QQ number, contact list and recent message history — consistent across every device you sign in on. It is not a full backup service: locally cached files in your device's vault, and some per-device preferences, are not part of cloud sync. Understanding this distinction saves a lot of confusion later.
On each device, sign in with the same QQ number. This is the foundation of cloud sync — your account is the thing that roams.
In QQ settings, keep message roaming/sync enabled where the option is available, so recent chat history downloads on each device rather than staying on just one.
When signing in on a new device, confirm the login from a trusted device if prompted. This keeps your synced account secure.
After sign-in, check that your contact list and recent chats have downloaded. On large accounts this can take a moment the first time.
For anything outside cloud sync — cached files, long local history — back up your vault folder and keep a markdown note of your account details, as cloud sync alone will not preserve those.
QQ cloud sync keeps your account-level data — your QQ number, contacts and recent message history — available across devices when you sign in. It does not work like a full file-backup service; locally cached files and some per-device settings stay on each device.
Sign in with the same QQ number on each device and keep message roaming enabled in QQ settings where available. Recent history then downloads on each device. Older local-only history may not roam unless you back up the vault yourself.
Not as a dedicated file backup. Cloud sync is about keeping your account and recent chats consistent across devices. To preserve received files long-term, back up your local vault folder manually.
Sign in with one account and keep your chats everywhere.