ArGest Backup User Guide

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Definitions and Concepts

The following are terms that will be used through this manual and the associated command line argument when using BRU from a terminal.

backup | archive (-c option)
Used synonymously with backup. When you back up files you create an archive containing copies of the files. The archive is used both as a verb and a noun.

extract (-x option)
To restore from an archive.

full backup
A backup of all files on the system. Typically, this includes system files, system programs, and temporary or work files.

incremental backup (-n option)
Incremental backup copies (backs up) all files that have been modified (changed) since a given date. A combination of full system backups, usually at weekly intervals, and daily incremental backups is a common backup scheme. Incremental backups are smaller and therefore less time-consuming than full backups to run and monitor. They also use less space on whatever media you use.

differential backup (-n option)
A differential backup includes all files that have been modified or created since the last full backup was performed. Differential backups differ from incremental backups in that files will be backed up multiple times even if they have not been modified since the previous differential backup.

partial backup (-QX and -X options)
A backup of only parts of the system. Typically a partial backup will not back up system files, the files that contain system programs, work files, etc. The files that are to be backed up may be specified by typing file names on the command line, by reading in a file that lists the files you want to back up, or by telling BRU to look at the bruxpat file. For a more complete description, refer to Chapter 15.

restore (-x option)
Extract files from an archive and return them to your normal filesystem.

inspect | verify (-i option)
BRU’s primary verification method. This recalculates the checksums for the data blocks written to an archive to compare them against the checksums created with the backup that was initially executed. Any differences reported could indicate a problem with the data included in the file listed.

differences | comparison (-d option)
This verification version will compare the files in an archive to their original version on disk. This mode is helpful for comparing a known-good backup against a system disk to check for tampering. The -d operation will report any differences that exist between the tape and the disk files.

table of contents (-t option)
To list the contents of an archive in a file-by-file listing.