Updates and websites will stay online?!

Hello,

at the moment we run 3 Plesk Server with Version 12.5.30. In a few month we will migrate to Onyx.

We install updates only by hand. Our latest update was 69.

In order to install this important security update:

PFSI-61276 security fix

we have to update from 69 to 79

Change Log for Plesk

I am a bit scared, that during the update...

Updates and websites will stay online?!