[Feature] Backup & Export settings

[Roxo7777]

Platform

Android

Linux Distribution (if applicable)

None

Why is this feature needed?

It is useful if you have several custom instances/domains, and if you also have books saved to download later or just simply saved.

Feature Description

**It would have two buttons at the bottom of the configuration page, one to export the backup, and one to print the backup. The backup would restore the saved books, instances, and general settings. **

Alternatives Considered

No response

Additional Context/Screenshots

Example of many instances/domains

Checklist

• I have searched existing issues for similar feature requests.

[warreth]

Please make another issue if you want a feature to save books for later.
I will consider the settings backup&export tho.