Nope, the script appears to be correct.
I'm starting to wonder if Ubuntu properly supports -mmin as I have heard of cases where it's incompatible with *nix systems (though I'd be amazed if GNU find hasn't since implemented it).
However he could try relacing -mmin 720 with -mtime 1 -mtime +1
ubuntu will recognize the -mmin +720.
if he put the cp -rp like you suggested earlier into the script (which it appears to be from a previous post of his), then he is preserving the timestamp as well, so the modification date will not change, i'm sure if he drops the cp -rp and goes back to cp -r like he originally had it, it should now work.
and btw, chmod 755 , does not alter the modification date of the file(s).
Edited by Transhour - 12/9/11 at 5:48am