[Duplicity-talk] PAR2 for duplicity

[Gabriel Ambuehl]

This has come up before, but I'm wondering if anyone is really interested in 
it.

Since duplicity stores data encrypted, a single bitflip could theoretically 
destroy a lot of data. Hence, parity as served by PAR2 and similar tools may 
be desired. 

There are two basic approaches: create PAR2 per backup run (i.e. for all 
files) or per individual .tar.gz.gpg. The former has the advantage that the a 
whole file may be missing and recovery possibly still would work. But for 
recovery to work, you'd have to have all files available which is obviously 
not the case if PAR2 is done per archive. 

Storage requirement for the same amount of redundancy in theory is the same 
(5% seems like a good default).

Thoughts?

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