A 'hidden cost' of being a pro Locked

Penguin et al:

I am realatively new to making a living with my camera and mass storage so please bare with me.  I have recently upgraded to a D600 and suddenly my raw files have jumped up to 20-30 GB files.  I wish to keep them as well as the JPEG files for as yet is an undetermined time.  My 1.5tb WD internal storage drive and 2TB WB back up drive will be filling pretty fast as I start to pick up more and more business.  I recently saw a 4tb back up drive but this would be a pretty slow drive as the buffer wasn't that big..  It only cost $99.00 but has some other drawbacks as well...  I always back my data up on a dvd as well...  (soon to be a blue ray for more storage..)  My questions are:

1.  Is there an inexpensive online storage solution that I don't have to worry about my work being stolen you would reccomend?

2.  My system will handle the extra drive but... What if it dies with 10K pics on it, the down side is I have to pay an inordanant ammount of money to have the drive torn apart, data collected and a get a copy of the pic files with out any degradation so that I can still edit them?

3.  To those who have used online storage, do the files get degraded in any way making them harder to work with for any reason?

Thanks

Phil