There are a "hidden option" or other Wikimedia tool to do a simple image export?
I am using this so complex approach at terminal,
php maintenance/dumpUploads.php | \
sed 's~mwstore://local-backend/local-public~./images~' > /tmp/localList.txt
mkdir ~/MyBackupFolder
cp $(cat /tmp/localList.txt) ~/MyBackupFolder
... some "XPTO option" to do direct
php maintenance/dumpUploads.php --XPTO ~/MyBackupFolder
with no sed
...