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Two Types of Rman Backups :
1. Backup Sets
2. Image Copies
Backup Set :
1. By Default RMAN backups are in Backup Set Formats.
2. Each Backup Set contains one or more backup pieces.
3. Backup Set contain One or More datafiles, Archived redo log files or Controlfiles.
Image Copy :
1. RMAN image copy and a copy you make with an operating system copy command such as dd (which makes image copies) are identical.
The Difference is :