Comparison of File Systems

This is a useful table that I'll have to look at more closely, but it wouldn't have predicted or prevented a problem I've had.

I recently had my home-grown[0] backup system fail silently because although the EXT4 formatted drive had bags of space remaining[1], it ran out of i-nodes.

That was ... unexpected.

Is there a suitable file system that doesn't have that problem?

[0] I have specific and complex requirements not met by any system I found, so despite the obvious potential pitfalls, rolling my own that did exactly and only what I wanted was a reasonable holding strategy.

[1] The system monitors all sorts of things and emails me warnings.

Why is "Murders your wife" one of the columns and why did Reiser4 and ReiserFS qualify?