![]() Retrospect does a verify of backups of drives locally attached to the 'backup server' using a byte-by-byte comparison, but by default it does a verify of 'client' drive backups using transmitted MD5 checksums for increased LAN/WAN throughput in either case MD5 checksums are stored in the Catalog File entries. ![]() īecause Retrospect Pro was originally developed to work with error-prone tape drives (for which its custom-rewritten drivers were not always perfect), it was necessary to have it by default do a sequential reread of each backed-up file to verify that it was copied correctly. However Retrospect does not use its Catalog File in doing an Archive operation, which is basically a non-incremental backup with a 'move' option-an option which deletes the copied files/folders from their Source volume. Retrospect can also use its Catalog File to copy selected/all files-including older versions-from a Backup Set to another volume in the proper OS-specific format this operation has always been called Restore when done to the volume from which they were backed up, and was originally called Duplicate when done to a different volume. The Catalog File also enables a user to search for files-including older versions-without mounting the media of the Backup Set. Retrospect thus does versioning, and can back up a wide-enough variety of files to be able to do a bare-metal restore of a boot disk. ![]() The Catalog File enables Retrospect to do incremental backups to a Backup Set, copying only those files which have either not yet been copied to the Backup Set or which have changed since they were last copied. ![]() Backup Set is the original Retrospect term (still used in Retrospect Windows) for a group-which may have only a single member-of one or more tapes, CD/DVD discs, disks, or a single-member file or a single-member FTP site that serve as the destination individual volumes of 'media' are members of a backup set. Retrospect maintains a separate Catalog File-distinct from any OS-maintained directory-on disk for each backup destination-originally known as a Backup Set. This makes Retrospect distinct from such backup applications as Time Machine and CrashPlan, in which the conceptual 'client' pushes data to a backup 'host' (which may not be a full-fledged computer) at its non-'host'-controlled option. In the network backup scenario a 'backup server' computer host pulls data from host-attached drives and multiple networked workstations-called 'Retrospect clients', according to a host-scheduled script or host-initiated immediate action.
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