I keep different notes in different places. Most of my notes are on paper, although there's also a good amount as plain text files saved on various computers I own. More incidental, spur-of-the-moment notes are in Google Keep, which serves as a (very) poor man's Evernote that syncs between my phone and the cloud.
The bulk of my notes isn't kept in the cloud because they're heavily context-dependent, and I get little benefit from having them available at all times.