Leninism, Stalinism, etc. (countries you mentioned) are attempts to fix problems with capitalism identified by Marx and Engels.
Marxism is a method of socioeconomic analysis and it true that Marx and Engels writing offered scientific/philosophic background for revolutions (which ended up worse than capitalism). But their critique of capitalism is still very much valid.
Bugs will always exist :( - and even if your data is in the cloud it is always good make one more copy.
For example, you can use cloudHQ to backup to Dropbox: https://www.cloudHQ.net/backup_to/dropbox
As founder of cloudHQ, I have to jump into this.
Software products will have bugs. And people will make mistakes. We are all human.
So even if you store data in Dropbox - it is smart to have one extra copy in some other cloud storage. Like Google Drive. Or Box. Or Egnyte. So if data is deleted in Dropbox (accidentally, maliciously, or due to a bug) you can restore it from other cloud.
Marxism is a method of socioeconomic analysis and it true that Marx and Engels writing offered scientific/philosophic background for revolutions (which ended up worse than capitalism). But their critique of capitalism is still very much valid.
If you want be successful capitalist you need read "Das Capital": many things will become clear. Or just watch it: http://davidharvey.org/reading-capital/