generic evil corporation behavior
From Android 12 onwards the only way to backup your app data is through Google's cloud. They removed the previously available convoluted way that let you do it yourself to your own computer.
Of course custom ROMs solved this problem with Seedvault, but that will never get upstreamed into base Android.
https://snug.moe/files/13b6daa3-7177-4d74-ba1c-e1bc9354fcb1