backup drive用乜file system 好?

ext3 VS ntfs

usb 既ext drive (connect to synology NAS)
剩係用黎backup 所以performance 不是考慮因素
單從recover 層面睇 (both partition corruption & accidentally delete files)
邊個FS 會比較適合?

recover corrupted partition 好似ext 會好D
但undelete files 又好似係ntfs 好D

ok just found out the time backup of synology just supports ext not ntfs
I have to go for ext4 then