migrition – to which database will it be restored

Hello,

to upgrade to a new theme I migrated my wordpress to a temporary subdomain.

I saved all with updraftplus, including the database.

Now I want to restore it to the subdomain on the same server, also with updraftplus.

In the new instance of wordpress I also set up a new database for this.

While restoring I get the warning:
“This looks like a migration (the backup is from a site with a different address”

That is ok so far. But to which database will it now restore? To the new database in the new wordpress installation or to the original database?