An IT administrator schedules a full backup to run every Sunday night. A differential backup is scheduled to run every night on Monday, Tuesday, Wednesday, and Thursday. If a critical server fails on Friday morning, which backup sets are needed to restore the server to the state it was in on Thursday night?
Only the full backup from Sunday
Only the differential backup from Thursday
The full backup from Sunday and the differential backup from Thursday
The full backup from Sunday and the differential backups from Monday, Tuesday, Wednesday, and Thursday
To restore from a differential backup, you need the last full backup and the most recent differential backup created before the failure. In this scenario, that would be the full backup from Sunday and the latest differential backup from Thursday. A differential backup contains all the data that has changed since the last full backup. The process of restoring a full backup and then all subsequent backups in a series applies to incremental backups, not differential ones.
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