for really  long term storage...
if you have any management class with long term retention you get screwed by
all your directory info being stuck in it and I've learned the error in my
ways with (10yrarch management classes ! )
Here is a "best bet" !
register a node with name "blah_exp"
have the client (if uinx) set a server entry to connect to the tsm server
using a "NODE blah_EXP" entry...
have the client "archive" the data for long term retention, then do an
"export" of the node "blah_exp"
you could perform your export to a CD if you had the ability to burn CD's...
I do export to tape, take them out of the ATL and send them offsite...

just my 2 cents worth

Dwight