Yes, iCloud Mail data can be saved to an external hard drive by exporting the required mailbox content to a local destination. This approach is useful when you want an offline copy of important emails instead of keeping the data only in the cloud. Before starting, check the external drive's available storage and select the iCloud Mail folders you need. Keeping the original mailbox unchanged until the backup is verified is also recommended.

By Using Aryson iCloud Backup Tool, you can access iCloud mailbox folders, preview the available email data, and select the required content for backup. The software supports several output formats, including MBOX, PST, EML, MSG, PDF, DOC, and EMLX. You can also apply available filters and maintain the mailbox folder hierarchy while saving the selected data.

To backup iCloud to external hard drive  from iCloud Mail, sign in to your iCloud account, select the required folders, choose an output format, and specify the external hard drive as the destination. Start the backup and then review the generated files to confirm that the required emails, attachments, and folder organization are available on the drive.