What is the recommended strategy for managing Inkscape configuration directories during major version upgrades?

Inkscape stores user preferences, custom extensions, and keyboard shortcuts in a per-user configuration directory. Because these paths vary significantly between native installations and sandboxed formats like Flatpak, a major version upgrade can lead to inconsistent settings or perceived data loss if the application fails to migrate the existing profile correctly.

Since Inkscape does not provide an automated backup or rollback mechanism for these directories during the upgrade process, users must manually manage the configuration folder to avoid permanent loss of customizations.

Which specific directories should be backed up to ensure a full recovery of extensions and preferences across different packaging formats? Does Inkscape provide a built-in method to validate configuration compatibility before applying a new version's defaults?