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It seems to me that exfat disks are not correctly recogized. Sabnzbd gives me the error message "Completed Download Folder /data/Downloads is on FAT file system, limiting maximum file size to 4GB", but it is an exfat partition and could actually store files bigger than 4GB if sabnzbd only tried.
I'm on Arch linux with exfat-linux-dkms installed.
sander@witte:~$ df -T /media/sander/0123-4567/
Filesystem Type 1K-blocks Used Available Use% Mounted on
/dev/sdb1 fuseblk 60784640 16768 60767872 1% /media/sander/0123-4567