Hello Magnolia25,

If you want to implement this yourself, you should look at the make_path function in the core module File::Path, and consider testing files either with one of the file test functions (such as -A for access time) or (better) with a module such as Digest::MD5 to determine which files need updating. (If you use MD5 you will need to store the known file hashes. A lightweight database such as DBD::SQLite will be useful here.)

But why reinvent the wheel when a module such as Dackup is available on ? As a test, I created a text file in a suitable directory structure and then ran the following script (adapted directly from the documentation):

#! perl
use strict;
use warnings;
use Dackup;
 
my $source = Dackup::Target::Filesystem->new
(
    prefix => '.\tmp\home',
);
 
my $destination = Dackup::Target::Filesystem->new
(
    prefix => '.\home',
);
 
my $dackup = Dackup->new
(
    source      => $source,
    destination => $destination,
    delete      => 0,
    dry_run     => 0,
    verbose     => 1,
    throttle    => '1Mbps',
);

$dackup->backup;
[download]

I then edited the text file and re-ran the script to verify that it copied the changed file to the destination (backup) location. You may need to experiment a bit to determine whether it meets your backup criteria.

Hope that helps,