dumping mounted file systems with insufficient space...

[Modulok]

Before I try this on a live server...

I can use dump(8) an active, mounted file systems via the -L flag.
According to the manual, this first creates a snapshot of the file
system, to the .snap directory of the file systems root. What if the
file system to be dumped, does not have sufficient free-space to store
a snapshot? Can I still safely dump(8) a mounted file system?

-Modulok-