Error 4GB

Hello, I have a question, when I try to start my server it tells me that it has already exceeded 4GB, but yesterday we were only at 1GB, I made a backup and it marks a weight of 1.3GB, is it an error or something like that? The only change was a datapack that gives coordinates of your death

Update: I get the notification on the screen even with a previous backup

I understand that, but I find it surprising that it is so compressed, download the world of the current save and the zip is 2GB and unzipped it weighs 2.1GB so for that reason I had doubts, since I don't understand much, thank you very much for helping me, my user is SEKingdom

Thank you! The server is fully functional, I fully appreciate your help.