Made it possible to run the backup, cleanup and monitor commands in i…

…solated mode

docs/advanced-usage/isolated-mode.md

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+---
+title: Isolated mode
+weight: 5
+---
+
+If your application's scheduler is running on multiple servers, you may limit the backup job to only execute on a single server.
+
+To indicate that the task should run on only one server, you may use the `--isolated` option when running the task on your server:
+
+```php
+php artisan backup:run --isolated
+```
+
+The first server to obtain the task will secure an atomic lock on the job to prevent other servers from running the same task at the same time.
+
+> To utilize this feature, your application must be using the `database`, `memcached`, `dynamodb`, or `redis` cache driver as your application's default cache driver. In addition, all servers must be communicating with the same central cache server.
+
+The following commands support the `--isolated` option:
+
+- `backup:run`
+- `backup:clean`
+- `backup:monitor`