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IBM-AUSTRIA - PC-HW-Support 30 Aug 1999 |
Differential Backup
Differential Backup
A differential backup
includes all files that were created or modified since last full backup.
Note the difference between incremental and differential: incremental
backups save files changed since the last (incremental or full) backup,
whereas differential backups save files changed since the last full
backup.
The advantages over full backups are that it is quicker and use
less media. The advantage over an incremental backup is that the restore
process is more efficient - at worst, the restore will require only
the latest differential backup set and the latest full backup set,
whereas an incremental backup could require all incremental backup sets
and the full backup set.
The disadvantage of a differential backup is
that longer and longer time is needed to perform them. The amount of
data backed up each time following the full backup gets larger and
larger. Compared to incremental backups, differential backups are more
wasteful of time and media - each backup would store much of the same
information plus the latest information added or created since the last
full backup.
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