feat(backup)!: add support for customizing backup names and use ids to identify backups

[NeoIsRecursive]

This PR improves the backup identification system, and makes it customizable.

This would be a breaking change since a sites current backups wont be recognized anymore.

TODO:

• client code still uses the "timestamp" (it gets sent an id in that value).
• figure out how too handle when a backup of an previous generator cannot be matched by the new one. - we dont the name resolver allows to return nothing and that will be handled by the backup repository