Peter Krefting [off-list ref] writes:
I find myself tracking OpenOffice files every now and then.
[...]
I notice, however, that the Git history tend to grow quite a bit,
<shameless ad>
Slightly off-topic answer, since it doesn't solve the disk space
problem, but you can have a look at
http://www-verimag.imag.fr/~moy/opendocument/
(which lets you use "git diff" on OpenOffice files)
</shameless ad>
--
Matthieu