docs: update custom locations and cleanup backup/restore paths (#9148)

* Create separate-storage.md

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* New article for docker storage on SSD

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* In the process, found errors in backup and restore

* Update backup-and-restore.md

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* Update custom-locations.md

* Update custom-locations.md

* Update custom-locations.md

* Update custom-locations.md

* linting

docs/docs/guides/custom-locations.md

@@ -2,8 +2,8 @@
 
 This guide explains storing generated and raw files with docker's volume mount in different locations.
 
-:::note Backup
-It is important to remember to update the backup settings after following the guide to back up the new backup paths if using automatic backup tools.
+:::caution Backup
+It is important to remember to update the backup settings after following the guide to back up the new backup paths if using automatic backup tools, especially `profile/`.
 :::
 
 In our `.env` file, we will define variables that will help us in the future when we want to move to a more advanced server in the future
@@ -12,10 +12,11 @@ In our `.env` file, we will define variables that will help us in the future whe
 # You can find documentation for all the supported env variables at https://immich.app/docs/install/environment-variables
 
 # Custom location where your uploaded, thumbnails, and transcoded video files are stored
-- {UPLOAD_LOCATION}=./library
-+ {UPLOAD_LOCATION}=/custom/location/on/your/system/
-+ {THUMB_LOCATION}=/custom/location/on/your/system/
-+ {ENCODED_VIDEO_LOCATION}=/custom/location/on/your/system/
+- UPLOAD_LOCATION=./library
++ UPLOAD_LOCATION=/custom/location/on/your/system/immich/immich_files
++ THUMB_LOCATION=/custom/location/on/your/system/immich/thumbs
++ ENCODED_VIDEO_LOCATION=/custom/location/on/your/system/immich/encoded-video
++ PROFILE_LOCATION=/custom/location/on/your/system/immich/profile
 ...
 ```
 
@@ -28,6 +29,7 @@ services:
       - ${UPLOAD_LOCATION}:/usr/src/app/upload
 +     - ${THUMB_LOCATION}:/usr/src/app/upload/thumbs
 +     - ${ENCODED_VIDEO_LOCATION}:/usr/src/app/upload/encoded-video
++     - ${PROFILE_LOCATION}:/usr/src/app/upload/profile
       - /etc/localtime:/etc/localtime:ro
 
 ...
@@ -37,6 +39,7 @@ services:
       - ${UPLOAD_LOCATION}:/usr/src/app/upload
 +     - ${THUMB_LOCATION}:/usr/src/app/upload/thumbs
 +     - ${ENCODED_VIDEO_LOCATION}:/usr/src/app/upload/encoded-video
++     - ${PROFILE_LOCATION}:/usr/src/app/upload/profile
       - /etc/localtime:/etc/localtime:ro
 ```
 
@@ -47,4 +50,14 @@ docker compose down
 docker compose up -d
 ```
 
+:::note
+Because of the underlying properties of docker bind mounts, it is not recommended to mount the `upload/` and `library/` folders as separate bind mounts if they are on the same device.
+For this reason, we mount the HDD or network storage to `/usr/src/app/upload` and then mount the folders we want quick access to below this folder.
+
+The `thumbs/` folder contains both the small thumbnails shown in the timeline, and the larger previews shown when clicking into an image. These cannot be split up.
+
+The storage metrics of the Immich server will track the storage available at `UPLOAD_LOCATION`,
+so the administrator should setup some kind of monitoring to make sure the SSD does not run out of space. The `profile/` folder is much smaller, typically less than 1 MB.
+:::
+
 Thanks to [Jrasm91](https://github.com/immich-app/immich/discussions/2110#discussioncomment-5477767) for writing the guide.