Integration into Android Backup API

[ChaosNicro]

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With the recent twitch change I reinstalled the app in an attempt to fix it, but forgot to export my follows before that. I use Seedvault for a non-google backup which informed me that Twire does not declare any data for A backup to the Android system.

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Submit follows and other data to the Backup-API.

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If Privacy is a concern, maybe a toggle-option could be added to opt-in to the backup-API. Other FOSS-Apps like Aegis have gone with that option.

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