Well it's kind of open to interpretation, which may be why they didn't want to directly say that, just imply it.
Article 19 of the Geneva convention:
The protection to which civilian hospitals are entitled shall not cease unless they are used to commit, outside their humanitarian duties, acts harmful to the enemy. Protection may, however, cease only after due warning has been given, naming, in all appropriate cases, a reasonable time limit, and after such warning has remained unheeded.
Now are firing qassam rockets "harmful to the enemy"? Probably.
Has due warning been given? Maybe? It's not well defined what that means. Does roof knocking count? Do you need to submit a form to their embassy?
I think the big problem is that the kind of warfare we are seeing here is unlike what they saw when they wrote those laws.
It really depends what you are using it for and how safe you want to be.
You could just use syncthing to keep a directory on your laptop synced with your home desktop. Still goes down if your home burns though.
You could do it with your friends house if you don't mind him being able to see your stuff. You could even have backups saved somewhere else.
It's a lot of work and cognitive load for the average person though.