I tried it out (after a bit of configuring) with the following:

#+BEGIN_SRC plantuml :file groupingComponents.eps :noexport
@startuml

package "Some Group" {
  HTTP - [First Component]
  [Another Component]
}
 
node "Other Groups" {
  FTP - [Second Component]
  [First Component] --> FTP
}

cloud {
  [Example 1]
}


database "MySql" {
  folder "This is my folder" {
[Folder 3]
  }
  frame "Foo" {
[Frame 4]
  }
}


[Another Component] --> [Example 1]
[Example 1] --> [Folder 3]
[Folder 3] --> [Frame 4]

@enduml
#+END_SRC

It looks a bit different, but I will not worry about it at the moment.

Is it best to save it as eps, or better another format? (When using it with LaTeX.)

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