Date-stamp in filename for a script

["Jay Barbee" <sysjyb@adm105.adm.louisville.edu>]

Excuse my ignorance in shell scripting, but I wanted to create a file that 
actualy had a filename that contains the date in the format:

backupYYMMDD.tar.gz

I can do:
date +backup%y%m%d.tar.gz

which give the correct output for the filename.  If I assign that to an environment 
variable such as TIMESTAMP:

TIMESTAMP='date +backup%y%m%d.tar.gz'

How can I use this as:
touch $TIMESTAMP

...or...

tar czvf $TIMESTAMP /

ect... I have seveal uses for this concept, and I know you guru scripters do this 
in your sleep.  any help?

--Jay


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