To clarify things.

You backup is correct, but it's not necessary to backup the
first 128 blocks of the arena partition. Its only contains
the Venti configuration and the ArenaPart structure.

Here is an example of what I described in my precedent message.

Create an arena partition at least as big as your original
one, and format it:

% dd -if /dev/zero -of arenas.img -bs 8192 -count 4194304
% venti/fmtarenas arenas arenas.img

Then copy your Venti arenas from the beginning of arenas00
(128*8192) to the end of arenas059 (3932258*8192):

% dd -if /dev/da1s4 -of arenas.img -bs 8192 -seek 128 -oseek 128 -count 3932258

Of course, '/dev/da1s4' can be 'fa' in your example.
If you removed the first 128 blocks, you don't have
to use '-seek'.

Finally, write the Venti configuration, rebuild the index
and Bloom filter, and start Venti.

-- 
David du Colombier

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