Split archives ( or multi-volume archives ) are often used when you would rather have your data split across a series of small archives rather than a single large one. For instance, if you want to backup an archive to a standard CD, the archive's maximum file size cannot exceed 700 MB.
You can create new multi-volume archives by entering a volume size ( the maximum allowed size for a single archive ) when you save the archive. Note that not all formats support creating split archives.