I heartily recommend avoiding subscription services like the plague.
Some subscription services offer a sufficient net benefit that I can overlook issues such as disappearing content. I subscribe to Spotify and it's been enormously beneficial for my musical appreciation on various levels. Yes, every two or three months I notice something on my list is no longer there. Sometimes it re-appears again, sometimes not. If I really miss that content, I can always purchase it.
I agree that I wouldn't trust a service-based backup system. Neither do I make serious use of Google's services such as Keep, or the office stuff, since I don't know if they'll still exist in two or three years. With cellphone, home internet and TV there is little choice but to go for a subscription. That said, when I next move I will switch those services to a smaller companies with a track record of providing good support and not being dicks.