Dealing with viminfo overwriting?

It's only within the last few years that Vim has become my main editor.

Now that I tend to use many vim instances at a time, I'm finding it
frustrating that I'm losing much of my command history due to firing up
'temporary' sessions that overwrite more useful history. A feature of
Zsh that I really love is INC_APPEND_HISTORY, where history items are
appended into history as soon as they're entered, instead of appending
the whole shell session's history upon exiting.

Is there any similar capability for viminfo? How does everyone here
deal with this kind of problem? (sessions? etc.)

--
Best,
Ben

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