Good question!

I usually get paranoid on whatever the current project contains, and backup every few iterations.  Then I have a whole bunch of files left over at the end, and cleaning them up gives me my reward ... lots of disk space! ;-)

Update:  Of course, the best way to backup a Perl program is to perfect it to the point that it's publishable, and upload it to Perlmonks.

s''(q.S:$/9=(T1';s;(..)(..);$..=substr+crypt($1,$2),2,3;eg;print$..$/

In reply to Re: I backup my files: by liverpole
in thread I backup my files: by planetscape

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