[Hampshire] Off-site backup (storage) services

Hi,

I'm investigating commercial services for collection, storage and retrieval
of backups tapes off-site. Can anyone recommend any such services?

Alternatively, in the on-line backup arena, we currently backup 3TB of data
in a full backup run. It is practical to use an on-line backup service for
this quantity of data or is the expense signficantly higher than the
storage services mentioned above?

Thanks,

Tony