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Suppose that I have a source drive (e.g., internal hard drive) and a destination drive (e.g., external hard drive).

Similarities

  • Obviously, they both involve copying files from the source to the destination.
  • They both involve copying of new or modified files only, not the entire source (after the initial transfer).

Differences

  • Incremental backup stores all the files, such that if a source file is deleted, the corresponding destination file will not be deleted. On the other hand, in file synchronization the destination mirrors the source, so if a source file is deleted, the corresponding destination file will be deleted.

What are other similarities and differences?

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  • Sounds to me like homework question...
    – Matt Clark
    Aug 27, 2015 at 22:28
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    It's 1-way vs. 2-way. Incremental backup copies newer files from source to destination. Synch also copies newer files on destination to source. If source and destination contents match and you delete a file from the source, synching will replace it from the destination. If you add a new file directly to the destination, synching will copy it to the source.
    – fixer1234
    Aug 27, 2015 at 22:48
  • @MattClark Yes, it does sound like a homework question, but it's truly not. Truly.
    – Andrew
    Aug 27, 2015 at 22:51

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