I am considering uploading some (all) of my digital personal data to Google Drive. I guess this would instantly grant access for NSA to my data. (Is that right?)

Who would have access to my data on my gDrive? After deleting some files on the Drive, will they actually be deleted? 


Google has access (obviously).
The police will have access if they have a valid search warrant.
A national security letter will give the FBI secret access.
Various three-letter agencies may have access, depending on how they're doing at circumventing Google's encryption.  (Google started encrypting its internal traffic after it was revealed that the NSA was monitoring it.  Modern encryption, properly applied, is believe to be sufficient protection against three-letter agencies -- all known attacks are against the "properly applied" part rather than the encryption itself.)


As for deletion, Google uses a highly distributed storage system.  I don't believe they will intentionally keep data after you delete it, but because of how Google's storage works, residual copies may stick around for a while.
