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WhatsApp iPhone syncs to iCloud unencrypted by default[1].

iMessage also syncs to iCloud unencrypted by default[2].

[1] Depends on you paying for iCloud storage, so that you have space for a full phone backup to occur.

[2] Might be "free" with "iMessage in iCloud", an option to enable separately.

> WhatsApp iPhone syncs to iCloud unencrypted by default[1].

Not true. You must choose to enable it or not when you set up new phone. On mine it does not back up

If you must "choose to enable" encryption, that implies it's off by default. If so, GP's statement is accurate.

Choose to enable backups.

No, I mean you must select yes or no. can't use WhatsApp until you make a choice yourself.