the config file for the first array is called omv-snapraid-114a88d2-53ed-11ed-8eee-b3f2573b9c38.conf again, so it was no accident that it was the same for both of us.
That should be a random uuid.
About the "scrub" configuration in the "Snapraid settings": Should I disable them also (as with the scheduled diff)?
How are you going to "disable" them? They are used in the diff script AND manual scrub commands in the plugin.
The "send mail" checkbox in the settings is checked, but I haven't received any mails after the manual syncs / checks. Do I have to do something else? I have setup my mail account in "System Notification"
Manual runs will never send emails but you do have to have notifications setup for the script if/when it gets fixed.