[thaumaturgy]

This article is nonsense. The author isn't saying anything substantive about the "security" of this particular company. It should go without saying that email backup services will currently, in most cases, need to store your email login information in a retrievable way.

A slightly better post might have been,

"Beware unproven email backup services. Don't forget that if they make a mistake, potentially all of your email messages can be exposed to someone else. Since you probably have account credentials for other services stored in your email box, that situation can get ugly really fast."

[laurenceputra]

so you do concede that it can get ugly really fast.

[thaumaturgy]

I "concede" that they are doing nothing wrong and you are way out of your depth here.

I strongly suggest that you drop this before digging yourself an even deeper hole in front of the people following this from Twitter.

[callmebison]

That's a value judgement you have to make, similarly to using any service hosted by someone else.

1) Is the potential loss of privacy worth the advantages of the service?

2) Do you trust the company providing the service?

3) Could you do a more secure job of it than the company?

It's not a service I would personally use, but I have no reason to think the company providing the service doesn't know what they are doing.