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Differrential & Incremental Backup

Hi All,

Could anyone confirm if my understanding below of Differential and Incremental backups is correct? Please confirm if what I have stated below is correct?

DIFFERENTIAL BACKUP:
Sunday: Full Backup is performed.
Monday : File A has changes, so only file A is backed up.
Tuesday : File B has changes, so file A and File B is backed up.
Wednesday: File A and C change, so File A, File B and File C are backed up.
 
Restoration for Differential: Sunday's Full backup is restored and then Wednesday's backup is restored.
 
 
INCREMENTAL BACKUP:
Sunday : Full backup is performed
Monday : File A changes, so only file A is backed up.
Tuesday : File B changes, so only file B is backed up.
Wednesday : File A and C change, so only file A and C are backed up.
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ben1211
Asked:
ben1211
3 Solutions
 
Lee W, MVPTechnology and Business Process AdvisorCommented:
Yes, that is correct.
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jburgaardCommented:
I use to think of this as a matter of backup-bit change.
Every file has some properties including backup-bit.
Differentiel backup does not change the backup-bit,
Incremential does change the backup-bit.
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SelfGovernCommented:
Or, think of it this way -- Differential backs up everything changed since the last full backup.
Incremental backs up everything changed since the most recent incremental or full backup.

JBurgaard is correct about how the archive (backup) bit works.
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