An incremental backup is a type of backup that only copies files that have changed since the last backup.
If a full backup was done on Monday, Tuesday's incremental will back up all changed files since Monday's backup. However, Wednesday's incremental will only back up files that have changed since Tuesday's incremental backup.
The main advantage of incremental backups is that fewer files are backed up daily, allowing for shorter backup windows. The disadvantage is that during a complete restore, the latest full and all subsequent incremental backups must be restored, which can take significantly longer.
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