Ext3 is in the works for the next product release and RAID is still in the queue
I know that there is lots of room on a USB stick, but there are some historic reasons for why we left ext2 in all versions. NASLite+ and NASLite+ for USB as well as the floppy disk based NASLite versions are all designed to mount and use drives interchangeably. That means there is no difference in user permissions and file system types, and there is no RAID support.
Many people use HDs mounted on mobile trays, and move those between NASLite servers at home or work as well as for offline backup purposes. In the constraints of a minimalist OS footprint, that will not be possible with RAID, multiple users/permissions, etc.
In short, on bootup, NASLite will mount any NASLite drive it finds, regardless of where it came from, and share it. Since permissions are flattened, everyone can access the content regardless of who wrote it and where. That’s what makes NASLite appealing to most people.
Now granted Ext3 will most definitely improve the performance of the above paradigm, especially during fschk
