Clipper escrowed keys. Where's the backup copy?

With all the talk about the problems with escrowed keys (and there
are plenty of problems) has anybody considered that there must be a
backup set of the keys somewhere?  I can't believe that the gov't would
spend all the time, effort and money and let the only copy of the keys
be accidentally (or on purpose if I get a chance) to destroy the key
database.  Therefore, there must be a backup set somewhere.  Who is
guarding these?  Where are they?  Who has access?  Has anybody heard
anything about this?

                                                     G.C.G.

 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 | Geoffrey C. Grabow          | "What we demand are rigidly defined    |
 | Oyster Bay, New York        |   areas of doubt and uncertainty!"     |
 |                             |         --------------------           |
 | grabow_geoffrey@tandem.com  | Clipper, SkipJack & Digital Telephony  |
 |                             |             JUST SAY NO!!!             |
 |----------------------------------------------------------------------|
 |  PGP fingerprint = C9 95 0F C4 E9 DD 8E 73  DD 99 4E F5 EB 7A B6 1D  |
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~