You should show some of the external command strings that you are using. Tar can be very difficult to get the option pairings right.

In lieu of you showing no code, here is a option string that took me awhile to get correct. You may have an option wrong, or maybe you want to add 2>&1>/dev/null to your options to quiet the output.

Passing the commandline options to tar, for example only, not tested recently:

 system ('tar','-c','-XEXCLUDE_FILE','-M','-L50000',"-F
       ./backup-rotate +.pl $basename","-f$basename-0.tar",$dir);
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