The ol Ubisoft formula? Yeah - I enjoy sprinkling them in to my gaming.
Easy to pick up. Only got a bit of time? Go unlock some area or marker. Got a longer amount of time? Make progress towards the main quest. That with achievements gives me a list of short and long goals I can work towards.
Funny that you mention it. I usually play an open world game in parallel with a heavier on rails RPG/CRPG – and opt for the open world game when I want a more “brain off” session.
If the SSDs aren’t ancient and there’s something useful in them – sure. Steam already backs up save files – so it depends what you have on them to require redundancy on backing up somewhere.