ITPEC FE Morning October 2021 Question 18
ITPEC FE Morning October 2021 — Question 18 of 80
Differential vs Incremental Backup — choose the correct description of backup methods.
Differential backup:
- Saves all files modified since the last full backup
- Each differential grows larger over time
- Restore needs: full + latest differential
Incremental backup:
- Saves only files modified since the last backup of any type
- Each incremental is small (only the delta)
- Restore needs: full + entire chain of incrementals
Comparison:
- Backup speed: incremental is faster (less data each time)
- Restore speed: differential is faster (only 2 sets needed)
- Storage: incremental uses less total space
Why not others:
- (b) — reversed: incremental is harder to restore (chain of sets), not differential
- (c) — "multiplexed backup" is not a standard backup classification term
- (d) — reversed: differential copies more files over time, not incremental
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