If you make an incremental backup, you are backing up everything altered since that last backup and the backup curriculum changes the archive bit to indicate that the file has been backed up(or, if you would, to indicate that it hasn’t altered since the last backup–last backup being the incremental backup you just made).

If you make a differential backup, you are backing up everything that has altered since the last full backup but the backup curriculum does not change the archive bit(or, if you would, the archive bit still indicates that the file altered but hasn’t been backed up yet since the last full backup).

Commonly incremental backups are made on a daily basis to supplement the last full backup. If you need to mend files you have to run the last full backup plus every incremental backup to the time you lost the files. Incremental backups reduce backup time.

Differential backups can be made on a daily backup, but the length of time it takes to make the backup will increase daily because it’s backing up everything altered since the last full backup. But, if you have to mend you only need the last full backup plus the most recent differential backup since it has a backup of everything altered since the last full backup. This is commonly a quicker restoration method even though the daily differential backup takes longer than the daily incremental method.

Hope this helps. I reckon that this is a touch you nearly have to drill yourself on until it sticks in your mind.

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