Please exclude download cache from backup

Whenever I take a backup of my smartphone through adb, it contains a large folder in /apps/com.aurora.store/, namely /apps/com.aurora.store/f/. This folder seems to contain all .apk files I ever downloaded. According to google documentation, this will result in aborting the backup (probably for online backup services) because the size is likely to be larger than 25MB.

Could you please exclude the cache from the backup? Here is the documentation but I sadly can't build+test it locally.