[gentoo-user] Creating binary packages before updating them

[Nikos Chantziaras]

Normally, when I'm about to update an important package, I back it up 
first using quickpkg.  I'm often in a situation though where many 
important packages are being updated in a world update.  Normally, I 
have to manually quickpkg every one of them.

Is there a way to tell emerge to do this on its own?  That is, create 
binary packages of every package that it is replacing?