Yeah, the question is whether google makes sense as a mail provided once you've decided that you needed to pay because of that feature.

If you're a company and don't want to manually handle email provisioning? Sure, why not. If you're an individual, Google isn't great. You could have a decent feature set along with great customer support elsewhere.

With an email addy relay like SinpeLogin you don't have to pay Google for that feature.

I misunderstood you then, "having your mail on google and syncing them" sounds like you still have a @gmail.com but taking backups. Having your own domain is indeed the safest, I do that actually