What potential limitations should be considered when using Gmail as a backup system with PHP?

One potential limitation when using Gmail as a backup system with PHP is the daily sending limits imposed by Gmail. Gmail has a limit on the number of emails that can be sent per day, which could restrict the effectiveness of using it as a backup system for large amounts of data. To address this limitation, you can implement a queue system in your PHP code to spread out the sending of emails over time, ensuring that you stay within Gmail's limits. 

// Example PHP code implementing a queue system for sending emails with Gmail backup

// Define your email queue
$emailQueue = array(
    "email1@example.com" => "Message 1",
    "email2@example.com" => "Message 2",
    // Add more emails and messages as needed
);

// Loop through the email queue and send emails
foreach ($emailQueue as $email => $message) {
    // Code to send email using Gmail API
    // Make sure to handle any errors and implement proper error handling
}

Keywords

Gmail API PHP mail function quota limits authentication error handling

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