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Backup Format
Traditional: Traditional backup compresses your data into a single proprietary file that you can restore only via the proprietary backup software. The amount of space such compression saves depends on the type of files involved (for example, JPEG and MP3 files are already compressed, so they cannot compress much further). Expect anywhere from 1.2:1 to 1.4:1 compression in most typical desktop file mixes.
Native: File copying (without compression), which is convenient because you can browse and restore them using nothing more than Windows’ Explorer. However, they require up to twice as much space as methods that employ compression.
Native Compressed: Exactly like Native but does not compress files using some proprietary software. Most systems will already have some type of software that will uncompress files like winzip or can attain them for free.
Backup Types
Full: A full backup of all your data.
Incremental and Differential: Incremental saves only the files that have changed between backups (full or previous incremental backups). Differential backups all changed files since your last full backup. Incremental backups take a lot less time, however, to restore from incremental backups, you must first copy back the initial full backup, and then restore each subsequent incremental backup. With the differential approach you restore just the full backup and the latest differential backup.
Sync: Data is synchronized between two drives. Each drive will be an exact duplicate of the other. Revision: Revision backup creates revisions of the files that you are using. If you are working on a Word document and have made several changes it will keep track of your changes and allow you to restore to any previously saved image.
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