How does the Time Machine backup a photo library if one photo is added ?

How does the Time Machine backup a photo library if one photo is added ?

I am asking because I am worried about the fast use up of disk space on my backup disk.

Let's assume

1. Time machine (2 TB) is turned on and an initial backup has been made. Backup set to daily.
2. There is a 100 GB photo library on the internal HD, which is included in the backup.

Question:

What happens if there is a change in the photo library e.g. one photo is added ?

Does the Time machine then make a backup of the entire library ?