Using IP addresses in general is fine - as long as they do not change. That's 
the reason why the name resolution must perfectly work.
In other words: If the FW is not the issue then the problem must be the name 
resolution.

With respect to individually listed save sets:
You do this when you do not want to backup everything or additional network 
paths which are not covered by the "All" alias. In general you have the choice 
to declare the list in either way:
  - Use "All" for all local hard disks partitions and OS specific SSs and use 
directives for exclusions
  - Use an individual SS list when this would be shorter and/or the data has to 
be backed up by a special procedure
You can even have more than one client resource in this case.

One simple example:
  - File system backup client
      Save Set: All
      Directive: 'skip the DB files'
      Backup Command: ---
   - DB backup client
      Save Set: /db_directory
      Directive: ----
      Backup Command: save_db_script

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