docs(api): designed the backup endpoints

docs/README.md

@@ -40,9 +40,9 @@ __(ND)__ -> Not designed yet.
         - [ ] `/delete` (ND)
 - `/admin`
     - `/backup`
-        - [ ] `/list` (ND)
+        - [ ] `/list`
-        - [ ] `/fetch/{id}` (ND)
+        - [ ] `/fetch/{id}`
-        - [ ] `/create` (ND)
+        - [ ] `/create`
 
 ## Examples
 An example _Register -> Verify -> Authenticate -> Delete_ flow.

docs/admin/backup/create.md

@@ -0,0 +1,49 @@
+# `/admin/backup/create` - POST
+Creates a new backup.
+
+## HTTP Headers
+| Header        | Content            |
+|---------------|--------------------|
+| Authorization | `Bearer {token}`   |
+| Content-Type  | `application/json` |
+
+## Content - JSON
+This json body defines what will be included in the backup.
+```
+{
+    "all": true
+    
+    / OR /
+    
+    /opt/ "NginxConfig": <bool>
+    /opt/ "MailServer": <bool>
+    /opt/ "Docker": {
+        /opt/ "Stacks": [<name/id>] / "all"
+        /opt/ "Images": [<name/id>] / "all"
+        /opt/ "Volumes": [<name/id>] / "all"
+    }
+    /opt/ "SslCerts": <bool>
+}
+```
+
+## Responses
+### 200 - Success
+__Content - JSON:__
+
+| Field   | Description                      |
+|---------|----------------------------------|
+| backups | A list of (id, timestamp) pairs. |
+### 400 - Error: Bad Request
+The request was malformed.
+### 401 - Error: Unauthorized
+The provided auth token doesn't allow you to perform this operation.
+### 403 - Error: Forbidden
+Blocked for security reasons.
+### 404 - Error: Not Found
+There was a unknown option in the content.
+
+__Content - JSON:__
+
+| Field   | Description                                                                 |
+|---------|-----------------------------------------------------------------------------|
+| problem | Tells you where the problem is. Example: "docker/stacks/not_existing_stack" |

docs/admin/backup/fetch.md

@@ -0,0 +1,17 @@
+# `/admin/backup/fetch/{id}` - GET
+Downloads the backup identified by `ìd`.
+
+## HTTP Headers
+| Header        | Content            |
+|---------------|--------------------|
+| Authorization | `Bearer {token}`   |
+
+## Responses
+### 200 - Success
+__Content - BYTES__
+### 401 - Error: Unauthorized
+The provided auth token doesn't allow you to perform this operation.
+### 403 - Error: Forbidden
+Blocked for security reasons.
+### 404 - Error: Not Found
+There was no backup found with the given id.

docs/admin/backup/list.md

@@ -0,0 +1,18 @@
+# `/admin/backup/list` - GET
+Lists all available backups.
+
+## HTTP Headers
+| Header        | Content            |
+|---------------|--------------------|
+| Authorization | `Bearer {token}`   |
+
+## Responses
+### 200 - Success
+__Content - JSON:__
+| Field   | Description                      |
+|---------|----------------------------------|
+| backups | A list of (id, timestamp) pairs. |
+### 401 - Error: Unauthorized
+The provided auth token doesn't allow you to perform this operation.
+### 403 - Error: Forbidden
+Blocked for security reasons.