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Answer Posted / sritharan
Types of backup
The Backup utility supports five methods of backing up
data on your computer or network.
1) Copy backup
A copy backup copies all the files you select, but does
not mark each file as having been backed up (in other
words, the archive attribute is not cleared). Copying is
useful if you want to back up files between normal and
incremental backups because copying does not affect these
other backup operations.
2) Daily backup
A daily backup copies all the files that you select that
have been modified on the day the daily backup is
performed. The backed-up files are not marked as having
been backed up (in other words, the archive attribute is
not cleared).
3) Differential backup
A differential backup copies files that have been created
or changed since the last normal or incremental backup. It
does not mark files as having been backed up (in other
words, the archive attribute is not cleared). If you are
performing a combination of normal and differential
backups, restoring files and folders requires that you have
the last normal as well as the last differential backup.
4) Incremental backup
An incremental backup backs up only those files that have
been created or changed since the last normal or
incremental backup. It marks files as having been backed up
(in other words, the archive attribute is cleared). If you
use a combination of normal and incremental backups, you
will need to have the last normal backup set as well as all
incremental backup sets to restore your data.
5) Normal backup
A normal backup copies all the files you select and marks
each file as having been backed up (in other words, the
archive attribute is cleared). With normal backups, you
only need the most recent copy of the backup file or tape
to restore all of the files. You usually perform a normal
backup the first time you create a backup set.
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