YouTube Cloud Sync: Keep Your Video Library on Every Device

By default, Chrome extensions store data in the browser's local storage. This means your YouTube Bookmark Pro library exists only in the specific browser where you saved it. If you use Chrome on your work laptop and Chrome on your home desktop, you have two completely separate libraries. Videos saved at work are invisible at home. Notes written at home are missing at work. Categories organized on one machine do not exist on the other.

For casual users who only use one computer, this is not a problem. But for anyone who works across multiple devices - a laptop and a desktop, a work machine and a personal one, or even two different browsers on the same computer - device-locked storage creates fragmentation. Your YouTube knowledge base is scattered across machines with no way to unify it.

Some users try to solve this by manually exporting their library from one device and importing it on another. This works but it is tedious, error-prone, and does not handle ongoing changes. The moment you save a new video on device A, device B falls out of sync. You end up with version conflicts, duplicate entries, and the perpetual anxiety of not knowing which device has the most current data.

Cloud sync solves all of this automatically. Enable it once, and your library stays consistent across every device in real time. No manual exports, no version conflicts, no fragmentation.

Cloud sync is not limited to your list of saved videos. It covers every piece of data in your YouTube Bookmark Pro workspace:

• Saved videos. Every video in your Library, including title, channel, thumbnail URL, duration, and save date.
• Categories. Your custom folder structure, including category names, order, and sort preferences.
• Notes. Every annotation you have written on every saved video, fully searchable on all devices.
• Timestamps. Every timestamp marker, including labels and the exact second they point to.
• Subscription folders. Your Subscriptions Pro folder structure, channel assignments, auto-routing rules, and channel health data.
• Settings. Your theme preference, digest bucket configurations, privacy mode state, and sort preferences.

When you save a video on your work laptop, it appears in your Library on your home desktop within seconds. When you edit a note, the updated text propagates to all connected devices. When you reorganize your categories, the new structure appears everywhere. The sync is bidirectional and real-time.

Cloud sync is powered by Supabase, an open-source backend platform. Your data is transmitted over HTTPS and stored in a PostgreSQL database with row-level security (RLS) policies that ensure only your authenticated session can access your data. No other user, and no YouTube Bookmark Pro administrator, can read your library contents.

What data leaves your device

When you enable cloud sync, the following data is transmitted to the sync server: your saved video metadata (titles, URLs, channels, durations), your notes and timestamps, your category structure, your subscription folder assignments, and your extension settings. Video content itself is never downloaded or stored - only the metadata that YouTube Bookmark Pro uses to display your library.

What data stays local

Your YouTube browsing history, watch time, and engagement data never leave your device. YouTube Bookmark Pro does not track which videos you watch, how long you watch them, or what you click on YouTube. The only data that syncs is the data you explicitly create inside the extension: saves, notes, timestamps, and organizational structures.

Authentication

Cloud sync requires a YouTube Bookmark Pro account, which is separate from your Google account. You sign up with an email address and password. Authentication uses Supabase Auth with JWT tokens, and sessions are managed per-device. You can view and revoke sessions from any connected device.

Real-time sync means that most edits propagate before a conflict can occur. If you edit a note on device A, the change appears on device B within seconds, and any subsequent edit on device B starts from the already-updated text. Conflicts are rare in normal usage.

When conflicts do occur - for example, if you edit the same note on two devices while one is offline - the sync engine uses a last-write-wins strategy with timestamps. The most recent edit takes precedence. This is a deliberate design choice: for the kind of data YouTube Bookmark Pro stores (notes, timestamps, category assignments), the most recent edit is almost always the intended one.

For structural changes like category deletions or video removals, the sync engine is more conservative. If you delete a category on device A while device B adds a video to that category, the sync engine preserves the video and moves it to an "Unsorted" category rather than silently discarding it. Data preservation takes priority over structural consistency.

If a conflict produces an undesirable result, restore points (described in the next section) let you roll back to any previous state of your library. This safety net means that even in the worst case, no data is permanently lost.

Every time your library syncs, the system creates a restore point - a snapshot of your entire library at that moment. Restore points are stored server-side and accessible from any connected device. You can browse your restore point history, preview the state of your library at any point in time, and restore to that state with a single action.

Restore points protect against several failure scenarios. If a sync conflict produces unexpected results, roll back. If you accidentally delete a category and its contents, roll back. If an extension update causes data corruption (unlikely but not impossible), roll back. If you simply change your mind about a reorganization you did three days ago, roll back.

The restore point system retains snapshots for a configurable retention period. By default, daily snapshots are kept for 30 days. This gives you a month-long safety net for any changes to your library. If you need to restore a specific video you deleted two weeks ago, the snapshot from that date will have it.

Restoring from a point replaces your current library state on all connected devices. There is no partial restore - it is an all-or-nothing operation. This keeps the restore process simple and predictable. If you need to recover a single item rather than your entire library, you can preview the restore point, note the item's details, and manually re-create it in your current library.

The device management panel shows every browser where your YouTube Bookmark Pro account is signed in. Each device displays its browser name, operating system, the date it was last active, and its sync status (synced, syncing, or offline).

From this panel, you can sign out a specific device remotely. This is useful if you lose a laptop, sell a computer, or simply want to reduce the number of active sessions. Signing out a device removes the encrypted sync data from that browser's local storage and disconnects it from the sync stream.

There is no limit on the number of connected devices. Whether you use two browsers or ten, every one of them can participate in sync. The sync engine handles concurrent connections efficiently, with each device maintaining its own local copy and reconciling changes through the Supabase backend.

PocketTube also offers cloud sync, but user reports across the Chrome Web Store and Reddit indicate persistent reliability issues. Common complaints include subscription groups disappearing after updates, sync failing silently between devices, and data resetting without warning after extension updates. For users who have spent hours organizing hundreds of channel groups, these failures are costly.

YouTube Bookmark Pro's sync infrastructure is built on Supabase, which provides PostgreSQL-backed storage with row-level security, real-time subscriptions for instant cross-device updates, and a proven track record of uptime. The restore point system adds a safety layer that PocketTube does not offer - if anything goes wrong, you can roll back to a known-good state.

The scope of sync is also different. PocketTube syncs subscription groups. YouTube Bookmark Pro syncs subscription folders plus the entire Library: saved videos, categories, notes, timestamps, and settings. It is a comprehensive workspace sync, not just a folder sync.