Sync isn't a backup system. It sync but takes time depending on how much data is being synced here. Also this is Firefox forum user help not a Help Support ticket helpline. Firefox forum doesn't do email or phone call help. It's all user posting help only.

This is my second email to you.... I just switched to Firefox from Chrome, because Chrome was crashing all the time. All I want to do is sync my computer, laptop, phone and Ipad's reading list. I want to be able to see an article on one device, add to the reading list, and have it on all devices. I'm logged in under the same name on all, and it says sync is on, but the reading lists are different. Can someone help me? My phone number is [removed phone# from public support forum], email is [removed email from public]. Thank you!

The is a Support forum for Mozilla products including the Firefox web browsers. There is no direct support by phone, chat or email. Please continue in your original thread at https://support.mozilla.org/en-US/questions/1423854