[GNOME, SSH] When to assert the 'Add bookmark' check box and how to retrieve?

[Detlef Lechner]

Hello list,

[GNOME] PLaces > Connect to Server > Service Type: SSH > In what
circumstances should I assert the 'Add bookmark' check box? 
The 'Help' did not give me an answer.
I am told that I should save these settings in a bookmark so that I can
connect again later without filling everything in.
How can I retrieve this bookmark? What directory stores it?

Kind regards,

Detlef Lechner