James, 

... 
> What I did was change the fileset from 
> "@[log in to unmask]" to "@[log in to unmask] - @.GROUP.ACCT, @.GROUP.ACCT".

I believe STORE translates "@[log in to unmask]" to "/ACCT/", where the trailing
slash means store all objects (files, groups, dirs) below.  Similar to
"-r" on many shell commands.

The thinking was, and is, if the system has HFS named files and/or
directories under the account it is better to store them vs. ignore
them.  STORE is one of the few MPE programs (maybe the only) to break
the MPE/POSIX file naming conventions.
In fact, an "@" wildcarded STORE will find more files than the same
wildcarded LISTFILE if there are HFS named files.  E.g. STORE @[log in to unmask]
finds more files than LISTFILE @[log in to unmask]

So, is it possible that you were originally backing up more files
(meaning HFS named files) than you thought?

STORE @[log in to unmask] - @.GROUP.ACCT, @.GROUP.ACCT  should be translated to:
STORE /ACCT/ - @.GROUP.ACCT, /ACCT/GROUP/

In other words, I don't believe we expand "@" to HFS syntax, with the
important trailing slash, on the right side of a minus, but each set of
filenames left of a minus has singular "@s" translated to POSIX syntax.

The translated STORE above means STORE will also select all files at all
levels under /ACCT/GROUP, but the HFS named files and dirs have not been
skipped in the previous store fileset. So, you could end up with more
files if you have many HFS files since they will be selected twice (1st:
STORE /ACCT/, 2nd: STORE /ACCT/GROUP/).

Try :LISTFILE /ACCT/,6  and :LISTFILE /ACCT/GROUP/,6 to see the files in
question.

This should work:
  :STORE /ACCT/ - /ACCT/GROUP/, /ACCT/GROUP/


HTH,
 Jeff Vance, vCSY

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