Option A: Local Storage (Default)
All data is saved locally on the user's device by default, ensuring privacy and fast access.
Users retain full control over their data, and all features remain available offline.
Option B: Cloud Sync (Optional)
If users require cloud backup or multi‑device access, they can manually enable the "Cloud Sync" feature.
Once enabled, users can selectively choose specific content to synchronize with their personal cloud drive, enabling flexible backup and cross‑device access.