Default [Q] Philz backup and restore (restore just apps and data)

guys in philz recovery i noticed under backup and restore i can backup or restore just apps or data , is it actually working ? so i can flash any rom and go too my backups and just restore all my apps and data on the new rom?just a piece of cake?
another question is if this is true , and i could be able to restore all the apps and data, can i choose some apps? i think the system apps are included in the backup and restoring them to the new rom should cause problems.