More than 7 years ago, I started the #FreeYourAndroid campaign for : FreeYourAndroid.org
Today, it is easier than ever to run a system with only free (libre) apps...
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Users will have substantially better privacy and security on an Android Open Source Project based OS than what you're proposing. The FOSS mobile app ecosystem is also far superior. You really have it backwards and you're just pushing dishonest FUD which is incredibly predictable.
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The entire point of this backup app is preserving the modern OS security model, verified boot, strict full system SELinux policy, etc. by properly integrating it instead of hacking everything together and taking shortcuts. What you're proposing is the absolute opposite of that.
It would be great if people like yourself spreading lies and harming users with your attempts at self-promotion did not exist.