What is the difference between Incremental and Differential Backup Techniques?

Answer 1

Incremental Backup:
1: Faster to create than a full backup.
2: Restoration is faster than using incremental backup.
3: Not as much storage needed as in a full backup.
Differential Backup:
1: This method is the fastest when creating a backup.
2: The least storage space is needed.

Answer 2

Differential backup backs up only the files that changed since the last full back up.

Incremental backups also back up only the changed data, but they only back up the data that has changed since the last backup — be it a full or incremental backup.

For more details, visit site below:
http://www.acronis.com/en-sg/resource/solutions/backup/2005/incremental-backups.html

Answer 3

Differential backups: Differential backups are based on the last full backup performed and backup all changes since the last Full backup was performed.

Incremental backups: Incremental backups are based on the last backup performed and backup only the changes since that last backup (Full or Differential).