how to take a single save set backup from master backup server on xz client

Please elaborate your scenario. You need to define the save sets in the client resource on Networker server. If you want a single saveset, mention only that saveset.

If this client needs to be backed up on a storage node, mention storage ndoe name in Storage Node attribute of the client replacing nsrserverhost written there by default.

I am not sure what you are asking;
Are you asking how to set up a single save set or how to retrieve a single save set?

To set one up is pretty easy, this is how I did it:
Created a new group
created a new client, actually same client just had to do it by right clicking on client and selecting new.
Put the save set in the new client
Select the new group I just created.
Created a new schedule (or choose one already created) and add to client
Add the group to the pool (can be the same as other backups)

You don't have to but I created specific browse policies and directives.

I think the most confusing thing is the inter-relationship between client, group and pool. 1 client can have many different groups (savesets), pools can have many differnt clients and groups.

To retrieve a save set use either nwrecover or winworkr

Is there any way to find out what are the save sets are backing up daily. Not a problem if backup successful or failed.

The saveset list under clients will tell you what is supposed to be backed up everyday. You can also set up a notification to send you an email when the backup completes.

Also under monitoring you can right click on the client and select show details to see the details of the last backup.

Yes, you can use mminfo for that.

You can check the savgrp file, daemon.log OR setup email notifications at the end of each group for it to provide you with the information.