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[[!meta title="Why is Obnam not using standard file formats, such as tar or cpio?"]]
The standard file formats do not support the kind of advanced features
that Obnam is built for. For example, block level de-duplication,
or abolishing the difference between full and incremental generations.
It would be possible to build those features on top, say, tar, but
it would mean the tar is just a container for odd bits of data, which
still requires a custom program to restore from.
If you're worried that you might lose your copy of Obnam, and be unable
to restore, two points:
* You can store a copy of Obnam (in source and binary versions) in your
backup repository.
* Obnam is free software, and it's in Debian. You're pretty much guaranteed
to be able to find a copy and build a new binary.
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