This would be something #Nextcloud could really improve at some point, just upload the delta of the file and not the whole file.

Reproduce:
#Debian GNU/#Linux 12

head -c 5G Nextcloud/test/testfile.bin
head -c 200M > Nextcloud/test/testfile.bin

This will upload the whole 5G again.

Can someone check on Windows, does it do delta upload there?