Back up before you switch devices
Chat history doesn't always transfer automatically to a new phone, especially moving between Android and iPhone, so backing up beforehand is worth doing any time you're about to switch devices, not just as an afterthought.
This is different from exporting a single chat
A full backup restores your entire chat history and settings to a new device; exporting a single chat produces a plain text file of just one conversation for reading or saving separately. Use a backup when switching phones, and export chat when you just need to save or share one specific conversation.
Frequently Asked Questions
Are photos and videos included in the backup?
You can usually choose whether to include media. Including it makes for a more complete backup but takes longer and uses more storage.
Can I back up an end-to-end encrypted or "secret" conversation the same way?
Some apps exclude specially encrypted or secret chats from a standard backup for security reasons, so it's worth checking separately whether anything sensitive needs its own copy.