I don't even use Google, I use my own searx instance instead. Completely unpersonalized, and completely private. And I feel that it's better this way, cause privacy does matter.
I just use my old Britannica CDs. Completely private.
Using DuckDuckGo is fine for let say 98% of my searches (most of them probably IT related). For the rest, I go to Google or Bing or others. Is there Britannica on flash drives? I should add it to those 2%.
Wikipedia can be downloaded in its entirety in an easy to use package. For STEM articles, it's better than Britannica (and cheaper too).