It depends on why you're archiving your data. If you're archiving for compliance, it's critical to understand the specific regulations or policies you are obligated to uphold. Some compliance regulations indicate that you have to preserve and protect the data in an unchanging/unalterable state. That might require storage on a WORM device or a disk-based content-addressed storage (CAS) system with access controls that prevent file changes...
using authentication and preservation checksums. Some storage solutions tout this approach as the "preferred" archiving technique, but that's not necessary in every situation. For general-purpose file archiving without regard to compliance regulations, an ordinary disk or tape system would probably be adequate.
Go back to the beginning of the File Archiving FAQ Guide.