What are some alternative methods, besides using PHP scripts, for transferring files between servers securely?

One alternative method for transferring files between servers securely is using Secure Shell (SSH) file transfer protocols such as SCP or SFTP. These protocols provide encrypted communication for transferring files securely over a network. Another method is using a secure file transfer protocol such as FTPS or HTTPS, which also encrypt data during transmission.

// Example using SCP to transfer a file between servers
$localFile = '/path/to/local/file.txt';
$remoteFile = 'user@remotehost:/path/to/remote/file.txt';

exec("scp $localFile $remoteFile");