Data backup

Hi friends, i change the rom everyweek. Everytime i change the rom, i started the rom as new. I can backup apps and restore it. But how can i restore all of my data. For example if i m in miui 7.10.3 version. Now i backup my data only and flash the new rom like miui8. After flashing rom, can i restore the data which is already backup??? If u know how to restore all data please suggest me. Thank you