They do and have done for years now. There’s been a files app since 2017. They’ve had Advanced Data Protection available for iOS backups since 2022. Signal has just been lazy and found maintaining the Android backups to be a pain, so they refused to implement it for iOS.
They did support it since they released the Files app, as Signal shows. Nothing changed all these years, yet they're now rolling out backups for iOS too, so the technology is already there.
cherryteastain|5 months ago
joshjob42|5 months ago
ls612|5 months ago
nar001|5 months ago