Data Security

You can divide it into three big families:

DAS (Direct Attached Storage)
They are all the backup systems on media such as DAT, DLT tape families ; disks and ZIP's ; CD's, DVD's ; removable hard disks ; USB keys, etc. This family is the most common one, but also the less reliable because of its fragility; furthermore there is no outsourcing and everything's manual.

Storage Network
NAS (Network Attached Storage) and SAN (Storage Area Network), which are in fact big disks implanted in dedicated servers, are able to quickly copy a mass of data from the company's network, in order to restore it all at the same speed in case of problems.
They lack subtlely (in the management of your data's life cycle), they are costly (especially SAN), therefore they are meant for big accounts and quite big companies. Moreover, there is no outsourcing. This means that a NAS destroys itself as fast as the companies' others computers, since it stays local.

Remote Backup
They are all the systems using internet to secure data outside the company. Purely software, these systems installed on the computers you want to save suffer from the small-sized internet "pipes" and won't able you to deal with big volumes, particularly if you wish to restore.

DataPack belongs to the second and the third family. It is an outsourced NAS via remote backup. It enables you get round internet's limits while securing your company's data at the highest possible level.