Technical data

Using BACKUP
11.2 Understanding Types of Backups
11.2 Understanding Types of Backups
The following table lists the types of backup operations.
Operation Description
File operation Processes individual files or directories. Section 11.13 describes file
operations.
Selective
operation
Processes files or volumes selectively, according to criteria such as
version number, file type, UIC, date and time of creation, expiration
date, or modification date.
Performs selective save operations by using wildcard characters and
input file-selection qualifiers (for example, /BACKUP, /BEFORE,
/BY_OWNER [/OWNER_UIC], /CREATED, /EXCLUDE, /EXPIRED,
/MODIFIED, and /SINCE). Section 11.13 describes selective operations.
Physical
operation
Copies, saves, restores, or compares an entire volume in terms of logical
blocks, ignoring any file structure.
Image
operation
Processes all files on the input disk. The types of image operations are:
•Animage backup (also called a full backup) saves a copy of all
the files on a disk (or volume) to a special file called a save set.
•Animage restore initializes the output disk and restores an
entire volume.
•Animage copy operation initializes the output disk and copies
an entire volume; the image backup is a logical duplicate of the
contents of the disk.
•Animage compare operation compares the contents of entire
volumes.
Because an image copy or backup operation processes all files on the
input volume, you cannot specify file-selection qualifiers for these
operations. You can, however, restore files and directories selectively
from an image save set.
Incremental
operation
The two types of incremental operations are:
•Anincremental backup saves only those files that have been
created or modified since the most recent backup that was
performed using the /RECORD qualifier. (The /RECORD qualifier
records the date and time that the files are backed up.)
•Anincremental restore operation restores an incremental save
set. Specify the command qualifier /INCREMENTAL to perform
this operation. Section 11.16.2 describes incremental restore
operations.
Two types of BACKUP operations, file and image, support converting ODS-5 file
names to ODS-2 file names. Refer to Section 9.5.5.3 for more information.
Using BACKUP 11–3