Add an option to separate library backup from library downloads

[sunk3rn]

Describe your suggested feature

I would like if there was an option to separate the backup of the library and the downloads, like it was in tachiyomi 0.14.x and lower.

Other details

Not as a default, but an option

Acknowledgements

• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open or closed issue.
• I have written a short but informative title.
• If this is an issue with an official extension, I should be opening an issue in the extensions repository.
• I have updated the app to version 0.15.3.
• I will fill out all of the requested information in this form.

[SadmL]

If I understand correctly. You have 2 folders inside that folder that's you choose while initial setup/in settings - downloads and local. downloads for downloads, local for library.

[sunk3rn]

Sorry, I guess I wrote it poorly. I meant to choose a different directory for both of them since I don't want to backup my downloads and want to move my library backup to different directory that has other backups, synced with syncthing so it would be kinda messy with the present aproach

[AntsyLich]

The app now uses scoped storage meaning it will only have access to a single folder that user has granted access to. It's a requirement for targeting newer Android version.