docs: Add missing info to asset types and storage locations (#11358)

first

docs/docs/administration/backup-and-restore.md

@@ -149,9 +149,21 @@ for more info read the [release notes](https://github.com/immich-app/immich/rele
   - Preview images (small thumbnails and large previews) for each asset and thumbnails for recognized faces.
   - Stored in `UPLOAD_LOCATION/thumbs/<userID>`.
 - **Encoded Assets:**
+
   - Videos that have been re-encoded from the original for wider compatibility. The original is not removed.
   - Stored in `UPLOAD_LOCATION/encoded-video/<userID>`.
 
+- **Postgres**
+
+  - The Immich database containing all the information to allow the system to function properly.  
+    **Note:** This folder will only appear to users who have made the changes mentioned in [v1.102.0](https://github.com/immich-app/immich/discussions/8930) (an optional, non-mandatory change) or who started with this version.
+  - Stored in `UPLOAD_LOCATION/postgres`.
+
+  :::danger
+  A backup of this folder does not constitute a backup of your database!
+  Follow the instructions listed [here](/docs/administration/backup-and-restore#database) to learn how to perform a proper backup.
+  :::
+
 </TabItem>
   <TabItem value="Storage Template On" label="Storage Template On">
 
@@ -187,8 +199,19 @@ When you turn off the storage template engine, it will leave the assets in `UPLO
   - Files uploaded through mobile apps.
   - Temporarily located in `UPLOAD_LOCATION/upload/<userID>`.
   - Transferred to `UPLOAD_LOCATION/library/<userID>` upon successful upload.
+- **Postgres**
+
+  - The Immich database containing all the information to allow the system to function properly.  
+    **Note:** This folder will only appear to users who have made the changes mentioned in [v1.102.0](https://github.com/immich-app/immich/discussions/8930) (an optional, non-mandatory change) or who started with this version.
+  - Stored in `UPLOAD_LOCATION/postgres`.
+
+  :::danger
+  A backup of this folder does not constitute a backup of your database!
+  Follow the instructions listed [here](/docs/administration/backup-and-restore#database) to learn how to perform a proper backup.
+  :::
 
 </TabItem>
+
 </Tabs>
 
 :::danger

docs/docs/features/facial-recognition.md

@@ -36,7 +36,7 @@ Face detection sends the generated preview image to the machine learning service
 
 ## How Facial Recognition Works
 
-The facial recognition algorithm we use is derived from DBSCAN, a popular clustering algorithm. It essentially treats each detected face as a point in a graph and aims to group points that are close to each other.
+The facial recognition algorithm we use is derived from [DBSCAN](https://www.youtube.com/watch?v=RDZUdRSDOok), a popular clustering algorithm. It essentially treats each detected face as a point in a graph and aims to group points that are close to each other.
 
 :::note
 An important concept is whether something is a _core point_. A core point has a minimum number of points around it within a certain distance. A non-core point can only be assigned to a cluster if it can reach a core point; a non-core point can't be used to extend a cluster even if it's part of one. In Immich, the _Minimum Recognized Faces_ setting controls the threshold to be considered a core point.