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linux-android-backup
Discontinued Back up your device without vendor lock-ins, using insecure software or root. Supports encryption and compression out of the box. Works cross-platform. [Moved to: https://github.com/mrrfv/open-android-backup]
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Well for the bonus question, you can backup using Linux Android Backup (it also works on Windows and MacOS, and theoretically on Android). It backs up all your contacts, calanders, files and free apps in open formats (so can be reinstalled without the app if it is discontinued). A few days ago beta SMS and call log backup support was added as well.
Opencord is one I've seen mentioned here, but it's still in development.