Whatsapp, backup chat through the app not thru iCloud. There are two options for this, both iCloud and the actual app. Backup BOTH options. < this bit is important especially if your texts are important
LINE, im assuming you go into the app and look for the "back up" option too. I havent used this app in a long time so i can't remember this bit.
Whatsapp iCloud normally backs up the photos and **** you want the most but for the most part i think texts and those are done directly through the app , not apple's iCloud setting. So double check those