No local copy is bad idea.
All "Clouds" go out/down, loose data, etc, w/ no warning. Read ToS etc because most will say is your problem for not backing up.
Even Amazon MS and other big services have had problems lasting for hours to days.
If he/she thinks traveling is easy w/ cloud... Often Not the case.
1. Service(s) on line won't matter when can't access it/them on slow/no internet.
Example: My vacation hotel has very slow to no internet WiFi. I've had to connect to 4 networks/AP just to get a slow connection to post this. YT crawls even at minimum video size/data rates. Wife's needed 2+ hours to post 2 reports using "the cloud" because Max speed is <15Mbps.
2. 3G 4G etc may not help either depending building construction etc. I can't even get a cell calls or text in many areas in this building. Trying to login to any network w/ "2 factor" login using cell/text often needs to sent a text several times to get a code from google etc.
3. On a Train/Plane/etc have problems too.
All The Stations and many others had problems getting WiFi and Cell service to make deadlines for videos/shows dates.
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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave