ITPEC FE Morning April 2019 Question 55

Schedule the backup so it does not overlap with business processing — a backup loads the disks, CPU and network, which would slow the business response time.

Copying large volumes of data competes with online transactions for the same resources, and some backups also need files to be quiescent. In a new system the backup is therefore planned into a window outside business hours, such as at night or at weekends, so that users see no increase in response time.

Answer (a)

Why not others:

• •(b) — long-term retention does not call for random access; archives are usually kept on sequential media such as tape, which is cheap and durable, since archives are rarely read
• •(c) — a differential backup shortens the backup time compared with a full backup; recovery then needs the full backup plus the differential, so it takes longer than restoring one full backup
• •(d) — a backup on the same medium as the source is lost with it when that medium fails, which defeats the purpose of the backup

Key rule: Plan a backup around three things: when it runs (outside business processing), where it is kept (a separate medium, ideally off site) and how long recovery takes (fewer generations to restore means faster recovery).

Software · AI-written, may contain errors