what is the privacy assurance of these online storage places ? when google is handing over data to US, I wonder if these smaller companies will keep our data private ?
I cannot speak for companies based overseas but I can say that just about any company in the US must and will have to comply with a court order to hand over data. I think you need to be more worried about these smaller companies actually being targeted because they won't be able to launch a fight against a court order like a Google, Dropbox, Box.net or any other big company can try to.
I just read a news article about Dropbox specifically the other day.
Long story short- Dropbox searched through a user's files, found something illegal and then notified police. User was arrested.
Illegal files or not aside, the point is that Dropbox did not act based on a court order. They willingly stepped in and turned over information on a user without ANY legal push to do so.
They were sure to note in their response to question that upon finding said information in a user's dropbox storage area, they immediately remove any/all encryption THEY place on files, but are unable to remove any that the user may have placed on said files.
The real moral of the story is that if a person has a file of any type (legal or not, that isn't the concern here) that they do not want anyone else to see, it should NEVER go online ANYWHERE.
Any file hosting site/company can promise security all they want, but the security should never be assumed to be actually true.
Also keep in mind that any information transferred between two computer systems which will use an internet service provider of any kind is subject to interception/viewing.
Don't talk to me about how the NSA CAN'T break encryption because I will not have it. They can, they will, they do. To think any kind of encryption is unbreakable is foolish to say the least.
One could argue that for normal file backups/storage the online solution would be fine. Maybe...