You are correct.

Another 2 cents:
 long-term archive does not only consist of the sole problem to keep the
data safe for a long period of time.
 Some other points are often overlooked, here only some of them:

        - availabilty of system which the data can be restored on
        (if you backed up your unix file 6 year ago with TSM and moved later
to NT,
        you will not be able to retrieve your data unless you keep a working
unix machine alive,
        even worse if you moved to veritas or Tivoli stopped TSM development
in the meantime..)

        - availability of programs which can display / operate on data
        or are you able today with the documentation you wrote 10 years ago
with an XY editor?
        Evene with text files - moved from ebdic to ascii?
        How about databases and so-called databases?

        - availability of personal who knows the data and how to use it.
        Even if this had been documented - will you find the documentation?

        - tracking the archive
        Even if you still have the data, would you be able the correct data
to be restored 10 years ago?

        - access rights: will you know in ten years who has the acces to the
restore?
        If protected by passord - will this be available?

        etc. etc.

To summarize:
you have to think not only about archiving the data,
but about archiving of the whole working environment.

regards
Juraj Salak