Keeping certain game's savedata after restoring
Hi! First of all, sorry for my english, I'll try to explain it the best I can.
I have an iPad 4, running iOS 8.1.2. It's been working a bit slow lately, and I guess that it needs a restore, and also an update, because of Apple Music, security fixes and that stuff. The thing is, my mom uses it to play some games like Farm Story 2, Kitchen Scramble, Cooking Fever... You know, farming and cooking and that stuff. I know they're based on servers since they require an internet connection to work so here comes the problem.
I know that not every game syncs its savedata with iCloud, so if I restore, I have to make a backup with iTunes. Does this backup include the savedata of this games? I have the doubt cause I don't know if they're synced with the servers of the game developers itself or if they are stored locally.
Hope it's clear, I'd appreciate your help SO much. Thank you in advance!!!
iPad, iOS 8.1.2