Can I use iCloud to back up and then return my fiels for system restroe? I just wanna back up my music and photos so I can do a system restore if I have iCloud will it allow me to download them back on once I finish the system restore?
No. See iCloud- Backup and restore overview
If you need to do a system backup for your computer then get a backup drive and use Time Machine.
If this doesn't answer your question then you need to explain what you want to do clearly.
Retrieving data ...