Two things about Carbonite (or similar services):

One: How can they guarantee the security of my data? Is the backup encrypted? Their advertising never mentions it.

Two: My total system storage capacity is around 10 Terabytes, about half of which is used for actual storage (including my own backups). How many years would it take to put three terabytes on Carbonite?

Thanks, but it now costs less than $100 for a 2TB drive. That's better than paying month after month for off-site unsecured storage that I'd never be able to fill.