cloud-storage and online-storage seemseem like tag synonyms to me.
I would prefer online-storage to be the master (19 questions), because it is more generic, though cloud-storage has more questions (about 74).
Agree, disagree?
My opinion after reading some of the rather passionately written answers:
Though cloud-storage and online-storage may not have the same textbook definitions, I find it safe to say that users who frequent SU do not give a hoot about these definitions. When they talk about online- or cloud-storage, they mean stuff like Dropbox, Wuala, SkyDrive, WebDAV and whatnot. Actually, so do I. I don't see a point of having two different tags for two things so similar.
May I remind you of the purpose of tags:
A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
In the interest of simplicity, I move that the two be made tag synonyms.