ElephantDrive backs up all emails, contacts, notes, tasks and calendar from Microsoft Outlook.
Please note that your Outlook backup file (PST format) is still subject to the file size limitations per the specific edition you choose. To clarify, this refers to the entire Outlook PST file itself and not the size of individual emails, notes, and contacts.
It is important that you check how large your Outlook file size is. Personal plans are allowed file size of up to 1GB and Business plans are allowed file size of up to 5GB.
For information on checking the size of your Outlook PST file, click here.