You could run savegrp -n -p group
Look at the docs for savegrp:
-n No save. Cause save to perform an estimate as described for -E, but
not to perform any actual saves. This option also sets -m.
-p Runs the probe step on each client, so you can see which filesystem
would be saved and at what level, but do not actually save any data.
This option also sets -m. The output generated by the -p option may
show several save levels for each save set at different points in the
output, as savegrp learns the correct level. This is the expected
behavior, and can be useful for debugging. The actual level the
savegrp uses is shown the last time each save set is displayed in the
output. The media pool the save set would be directed to is also
listed in the preview output.
