> While I can't comment on the actual numbers, one thing one could consider > when restoring (from any medium/type) into a new empty file system is that > you can mount the destination fs async during the restore in order to speed > it up a bit.
I'll just add that mount(8) explicitly says so:
The most common use of this flag is
to speed up restore(8) where it can give
a factor of two speed increase.
