When using the multi-argument form of system, the arguments get passed directly to the binary so there's no implicit split on whitespace. So your tar command sees the "czv --exclude-from=$excludes -f" as one big parameter and tries to interpret each character as a short option.
Do this instead:
my @args = ("/bin/tar", "czv", "--exclude-from=$excludes", "-f", $st
+orageLocation.$archiveName, $archiveDir );
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