Why I don't care for cloud storage...

AT&T HTC One M8 users see their Google Drive bonus wiped out, to return in May

Excerpt:
.. It seems that a "glitch" has deactivated the extra storage offer for AT&T customers, leaving them without the 50GB of space (Google Drive still comes with 15GB free on the base level). While Ed Kuhner, HTC VP of Customer Experience, promises that a fix is in the works, a resolution and the restoration of the missing 50GB isn't expected until mid-May:

    "A minor technical error has temporarily deactivated the Google Drive cloud storage offer for the AT&T HTC One (M8). Please be aware that we are working to fix this error, and the 50GB of Google Drive storage space will be available by Mid-May for this device."

So just a heads up, if you're running an HTC One M8 on AT&T, don't be alarmed if you notice that your Google Drive storage allotment has dropped considerably. It's coming back. Eventually.

And HTC has confirmed to us that the glitch only affects the actual AT&T version of the M8, and not the unlocked or developer versions (which are based on the AT&T SKU)...
-- Adam Zeis, androidcentral.com Apr 23 2014 | 5:29 pm (http://www.androidcentral.com/att-htc-one-m8-users-see-their-google-drive-bonus-wiped-out-return-may)

Now, why would you purposefully put YOUR data on someone ELSE's computer. And then be at THEIR mercy if they mess up.