Differential Back Up is when you make a copy of the data files that have changed since the last FULL back up (back up as you go along).
There is a significant distinction between differential and incremental backup. Incremental backs up all the files modified since the last full, differential or incremental backup. Differential backup offers a middle ground by backing up all the files that have changed since the last full backup.
Advantages:
- Restore is faster than restoring from incremental backup
- Backing up is faster than a full backup
- The storage space requirements are lower than for full backup
Disadvantages:
- Restore is slower than restoring from full backup
- Backing up is slower than incremental backup
- The storage space requirements are higher than for incremental backup
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