Gaia is nearly completely standalone and details like this don't matter.

Gecko does not directly require backup files, but certain libraries which it 
does depend on might not link without these files.

Full flashes change everything. There's only a small set of files actually 
recycled from the backup and everything else is just built or copied from 
source.

-Michael Wu

----- Original Message -----
> Currently the build system unconditionally does a backup on the first build.
> 
> Is that backup needed for gaia or gecko builds?
> 
> If I do a backup, build then and a full flash, is the only thing that
> is changing on my phone gaia and gecko since I'll be reflashing the
> original libraries that I backed up?
> 
> I want to understand if the backup setup is important for gaia and
> gecko dev because it means that I can't prepare an environment ahead
> of time without dealing with the backup step.
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> 
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