You can use the spool device : 

Set a(100)="test"
Set a(100,100)="encore"
Open 2 Use 2 zwrite a Close 2
The global ^SPOOL will contain the contents of the zwrite

In a simple configuration, one namespace uses one database.
But often, a namespace is a combination of a code database(=Routines), a data database (=Globals), and a bunch of mappings to other databases.

Looking at the names of your databases, it could well be the case that you need e.g. a namespace MYDATA1 which points for code and data to the database MYDATA1, and has Global Mappings for a list of specific globals to the database MYDATA1TEMP.

(You can see this list If you go to the portal -> explorer -> Globals, and select in the first combo 'databases' and the second 'MYDATA1TEMP', you should see a limited amount of globals that will probably hold temporary data which is stored seprately from you other live data.)

Ideally, the backup should also backup the file cache.cpf to get a list of the configuration of namespaces, databases, and mappings.