File redundancy is always important. One only learns how important when they lose their site once. If your site is php, you can even create a script to back up your site for you:

$files = "sitefiles_".date('Y-m-d').".tar.gz";
passthru('tar -zcvf  '.$files.' /path/to/files');

The passthru() function is like the exec() function, in that it allows you to run command line commands from a php file. We are using tar.gz to zip our files for maximum compression of size. This can be a big deal for our upload. To upload we use PHP ftp functions.

$server = 'server host here';
$connection = ftp_connect($server);

$login = ftp_login($connection, $ftpuser, $ftpPassword);

if (!$connection || !$login) { die('Connection attempt failed!'); }

$upload = ftp_put($connection, '/path/to/put/files/'.$files, $files, FTP_BINARY);

if (!$upload) { echo 'FTP upload failed!'; }

ftp_close($connection);
passthru('rm '.$files);

This will take the tar.gz file create earlier and upload it to a different server. We add that last command to remove the created tar.gz because we do not need it since it is elsewhere.

Our final script:

$files = "sitefiles_".date('Y-m-d').".tar.gz";
passthru('tar -zcvf  '.$files.' /path/to/files');
$server = 'server host here';
$connection = ftp_connect($server);

$login = ftp_login($connection, $ftpuser, $ftpPassword);

if (!$connection || !$login) { die('Connection attempt failed!'); }

$upload = ftp_put($connection, '/path/to/put/files/'.$files, $files, FTP_BINARY);

if (!$upload) { echo 'FTP upload failed!'; }

ftp_close($connection);
passthru('rm '.$files);