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A preservation of data takes place during a differential backup. The data that is preserved will only include differences since the last time a full backup occurred.
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Why would you perform a differential backup instead of an incremental backup?
An Incremental backup backs up only the selected files that have their archive bit set to ON, setting them back to OFF. This results in a backup of all files that are new or changed since the last backup, whether it was a full or an incremental. The advantage of an Incremental is that it takes the least amount of time and media of all the backup methods.A Differential backup backs up only the selected files that have their archive bit set to ON but does not set the archive bit back to OFF. A Differential backup will back up all selected files that are new and changed since the last full backup. The advantage of a Differential comes at restore time; you'll need only the last full backup and the last differential to get a complete restore. In the case of restoring with Incremental backups, all the Incremental backups since the last full backup plus the last full backup would be necessary.
Types of data backups?
incremental, differential, full incremental: backs up what has changed since the last full backup at increments of your choosing differential: backs up everything that has changed since the last differential backup full: backs up everything on your hard drive (WARNING: takes a long time and uses a lot of disk space)
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Which backup takes the longest to complete an incremental backup a daily backup a full backup or a differntial backup?
A full backup
Which backup takes the longest to complete?
a full backup
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