Hello all,
I haven’t found a solution, but I must say the problem was not as big as I had initially thought. After 3 months of using Time Machine, my 3 backups did not grow significantly. They did grow a little, but as much to create a problem.
If they keep like this, they will fill my disk in maybe 2 years, which is not so bad.
Things you can do to make them grow less fast is to exclude folders that hold temporary files, like the Download folder. Also, once a year, you can delete the backups and start over.