To save data on Cloud it is mandatory to have a Microsoft account
And if are using a Windows Phone 8 device, you should have created this during setup or while downloading apps.
You will also need a OneDrive account for saving photos and videos. You can go to onedrive.com or just download the app to create this account.
To save data On cloud follow the following steps
To backup your settings, Internet Explorer favorites, and a list of installed apps, head to Settings > Backup > App list + settings > Backup > On. Tap back up now to start the backup immediately.
To backup text messages, head to Settings > Backup > Text messages > Text message backup > On.
To save your photos and videos, go to Settings > Backup > Photos. Under both sub-heads – Photos and Videos – pick either Good quality or Best quality. Photos will back up good quality on your cellular Internet connection, but best quality photos and all videos need WiFi to upload.