Provided is a method in which data is received at the first storage unit.
A first information unit, a second information unit, and a third
information unit are generated, wherein the first information unit, the
second information unit, and the third information unit each include a
portion of the received data and computed parity data. The first
information unit is stored in the first storage unit at the first site.
The second information unit is distributed to the second storage unit at
the second site for storage. The third information unit is distributed to
the third storage unit at the third site for storage.