if database is not shrinked does it affect backup size? Ok my question is simple.

Lets say that when i click database and hover over shrink it says it can be reduced 1 GB space.

Now when i do a backup of this database, does this space also getting added to the backup file or backup process is somewhat special and it already shrinks it ?

SQL server 2012
The backup process does not back up empty pages, only pages with data, so typically, the backup file will be a lot smaller.

One important thing to note: when using compression, the initial size needed on the destination drive will be the uncompressed size; the backup will only be fully compressed at the end of the process.