Losing all the data in the system crash or any other mishap cannot be afforded nowadays because of which you should always backup your data be it on your system or on your outlook account. The backup of all the emails, calendars and contacts can be taken onto a backup tool called as the PST file and then you can copy this file onto an external drive or a cloud storage account which is secure. The PST files are those which can be imported into outlook without any data loss.
In case you already have a backup PST file that you created earlier for backup then Outlook will overwrite the data in that file for new backup. If you want to keep it separate then you can rename the file with the date.
If you stuck in any trouble, then contacting Outlook Technical Support Australia will be helpful. Here, you are guided by the experts team via live chat and email also, so choose the one which best suits your comfort.