I have it an old clam shell iBook, iMacs G3 G4 & G5, and dead Mid 2010 MacBook taking up closet space.
Want to remove all my info from to dispose in ewaste recycling.
I never disposed of any of these "Keep Sakes" on the ones that still start up and work but OS obsolete do I Erase including free space and leave it a that or do I need to do more?

Thanks,