So if I wanted to move a family (5 people) off Google Apps onto something else, not too expensive, decent amount of storage... Where should I look?

iCloud+ ?

I’m already paying them for Music, TV and 2Tb of storage (easier than convincing family to clean down their photos and videos!), and the custom domain is a recent add-on. support.apple.com/en-gb/guid…

I that a viable alternative even if not using Apple products? Also, how big is the lock-in factor? Would I be able to migrate away from it?