Image copies: all data blocks
Backup sets: no empty data blocks are copied (saves space). Typically 20% of database space is empty data block.
Granularity
Image copies: only the file we need has to be copied
Backup sets: all backup set must be retrieved even though only one of them is needed
A backup of a database running in NOARCHIVELOG mode must have all three attributes:
- offline
- full backup (level 0)
- whole database
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