Well, if you assume they are able to do copies of files, and in the end they are not, you will not go to heaven because you screwed up your familly.

Same as stop using the services, they might now even know they are using some @home services that are running in the background.

But I take the idea about having them making their own copy of files, and write down some instructions ablut what is where, and how do a backup they own.