How to Backup like in mysql or ms sql server

Hi all,

I'm new bie in postgresql.
I use postgresql 8.1 windows version.
How to back-up database in postgresql? Usually i use pgAdmin III by back-up and restore.
Is there any way to back-up database like mysql or sql server we just copy and paste. Or maybe there is any tools to copy database when the service is shutdown.

Where is postgresql put teh database files?

Thanks all,
Jokonet