eubar et al. are a suite of simple tools for archiving files, with file contents (by default) stored in one file and file metadata (including references to their contents) in another.
eubar is unusual in several regards.
First, you must tell it exactly which files to archive; it doesn't perform any kind of directory traversal, file filtering, etc.
Second, eubar itself doesn't have any file extraction capability; you must use the accompanying scripts eubout and eubotar to extract the contents of a single file or to create a tar archive, respectively.
Third, no advanced archive features are implemented -- compression, encryption, indexing, etc. These functions, if desired, may be supplied by external programs. For convenience, file contents may (if desired) be hashed using the very fast BLAKE2b algorithm.
libtar (for tar file generation) and libb2 (for BLAKE2b hashing) are prerequisites.