It all depends..
Using cloud storage as a backup/archival can work..
Depending on the criticality of the data, the frequency of the need to write/read from that data, and the time required to recreate that data..
If you're storing something like PICs, and it's the ONLY place you are storing those PICs, that's a bad idea.. ;-)
If you are storing a copy of the PICs, then it's not too bad an idea per se..
If, assuming the worst and your data goes POOF, you can just copy them back up to another site, it's not too big a deal...
Cloud can have it's uses...
Just make sure you aren't depending on it always being there... ;-)
desiv