Upload to SkyDrive is a software app that lets you upload your contacts and photos to the Microsoft cloud service. You can then access the uploaded data using other SkyDrive compatible devices, or online at www.live.com.
Also, once you buy a Lumia phone, the Upload to SkyDrive app allows you to transfer data you have on your Symbian phone to your new Lumia phone. If you have already uploaded your data to SkyDrive, you can just sync your Lumia phone with the cloud, making the data from your Symbian phone available to you on your new phone. Or, if your data is not in the cloud yet, you can do the upload once, then sync your Lumia phone with the cloud to get the data to your new phone.