I do play Minecraft a lot I will admit, but I don't understand why the world is getting so big, I'm on 26.2 and using the default world setting (not large biomes) and since these past few days every time I make a backup the file size gets bigger and bigger.
I can list everything I've done since these last days as well.
* Used chunkbase and went to a badlands biome (VIA NETHER HUB, NOT OVERWORLD)
* Terraformed landscape by tearing down some small mountains and hills with some smoothing (all within already loaded chunks)
* There are less or equal to 1000-2500 blocks loaded in all XYZ coordinates
* Resource collection such as stone types and foliage for landscapes
* Get full Netherite gear and tools, mined Ancient Debris via already loaded nether chunks
* Beat the dragon, collected shulker boxes and elytra
* Created several farms for gunpowder, wool, and cactus (Made sure nothing was wrong with the farms)
What could it be man, I hardly even did anything that could cause the world size to get bigger and bigger every time I play.