I recently upgraded my Samsung Galaxy S7 Edge to Android 7.0 (Nougat)..
I have used My backup Pro previously with Marshmallow successfully to backup and restore contacts. It also works well on my Tab 10.1 which runs on Android 6.
With Nougat I can backup but not restore.
On restore the system just hangs.
On my s7 edge i backed up Call log, SMS, MMS, updated my phone, few days later i wiped it, used MyBackup Pro to restore Call Logs, SMS, MMS. No issues.
I also used it on HTC 10 with nougat. Same results. Call Logs, SMS, MMS restored fine.