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I can confirm, the same happens on my server with Ubuntu 16.04.4 LTS and Plesk 17.8.11 MU #1. I have allready resetup the backup job. Afterwards one full and one incremental backup has been started and finished, but the last backup was 6 days ago.
Everything is right here. I'll try to reproduce issue at my test server.
Can you provide any additional details like is it local backup or FTP and so on?
In my case it is a FTP Backup for the server and the same behaviour for a customer created backup job storing locally. See the Images for settings. For both backups only the first full backup and first incremental is done.
It seems this issue was fixed with 17.8.11 MU #2 yesterday, because in the changelog it can be read: "Fixed the issue where scheduled incremental backups did not work after upgrade to Plesk Onyx 17.8 or after the first incremental backup was created on a clean Plesk installation. (PPP-35597)"
I have installed MU 2 and will report. Thank you @Marcio Nunes for your Step by Step guide. I have done Step 1, first of all which installed MU #2 ;-). I will see if it is working this night.