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WhatsApp also loses all e2e guarantees in the process. WhatsApp backups are not encrypted.

Signal on Android does support encrypted backups, however they're not automatically synced with anything. I think on iOS there's a different way to migrate your data, but it seems to require a PC.

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It depends what you mean by "end" in "e2e". It is encrypted all the way to my device. I do see the issue though.

Signal has all the capabilities to do this and have encryption. Why does the chat backup feature (with 30 character passphrase) not offer to store the data in GDrive so that Android can restore it? It's an encrypted bundle so that should be fine.

Signal on iOS allows direct transfer from one phone to another when they’re physically close by. There is no backup and restore if your phone is lost or broken. Messages also get deleted on the “source” phone once the direct transfer is completed to the “destination” phone.

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