I want reinstall Lacie OS.
I've written a wiki page
Excuseme - what is the plus in Debian installation?
The plus is that Debian
is a full-blown server OS, so you can run whatever service you want (provided your CPU and memory are sufficient). Debian has around 25000 packages available. Not all are useful on a NAS, as it's a bit impractical to run software with a GUI, but believe me, there is enough left.
The con is that you'll have to compile your own kernel, and will have to build your system (almost) from scratch. No fancy webinterface (unless you install one), no Samba (unless you install one), no ...