Important files and photos saved on Cloud service
Yes, your data is stored in multiple different locations. Most of the time cloud services has various datacenters in multiple countries on different continents. 

As user you don't know where your data is stored exactly and how many copies of that data is stored. But you can bet they have a backup of a backup of a backup. 

Because systems, servers, harddrives fail every single day their systems are designed to keep all the data save.

Keep in mind companies can decide to stop offering cloud services. So if you are a little bit smart, you have backups as well.