twest it's impossible to have backups only at night at the moment since you can't specify different times, for different servers so if the servers are in different continents one will be during high traffic hours doesn't matter what you do , also I didn't know backups are using user's resources - limits are you certain for that ?
I personally use similar limits asecpfence, and had big load spikes due to user swapping (server had available ram ) , also in some of the tests the user could use 30 GB ram, when the limit was 1024 .
And I can share more examples , unfortunately the answer most of the times is either that"my servers works like clockwork can't be something wrong " , or in case of enhance even after many tests we came to no conclusion as for why the high load occurs .
Same tests performed on DA +CL setup on the same hardware, without load spikes .
On none of the tests mysql performance was tested due to the fact that enhance doesn't limit anything there .
