Default [Solved] Change TWRP backup location

I always used CWM on my other phones and now installed TWRP and have following issue:

Like CWM, TWRP creates its own folder on SD-partition (internal storage on Mini). But the backups are stored in "root/data/media/TWRP/...", not in "SD/TWRP/...", so when backuping my files from phone I have to copy the TWRP-backup first to SD (I don't want to use adb etc. for that).

Why is TWRP not using the standard-folder on SD and can I change the location?

Also mounting internal storage doesn't work in TWRP. Any ideas?