007 - Ist Archivierung das gleiche wie Backup?

No, archiving is not the same as backup.

Definition of a Backup:
Regular copying of files to a dedicated storage system (backup system) to protect against data loss in the event of a hardware, system or operator failure on the primary or source system (e.g. server, workstation, etc.).

Definition of an Archive:
Copying selected files to a dedicated storage system (archive system) to keep them safe for a longer period of time. The original files can be deleted from the primary or source system after archiving to provide free storage space.

In chapter 2.1 of the ISP Best Practice Guide (PDF) this and other terms are explained and in subchapter 2.1.5 the differences between archives and backup are explained in more detail.