backup prior to maintenance

[Anne Crabtree]

I would like to know what the recommended procedure is for backing up the 
system prior to applying maintenance (and how to restore if there is a 
problem!!).  The last time I did maintenance, I backed up 510RES with DDRXA and 
when PUT2PROD had errors, restored 510RES from that tape.  To make a long story 
short, it really messed up the spool and I ended up on the phone for hours with 
IBM.  I need to put maintenance on again and want to make sure and do it right 
this time.