how to delete the entire history before a certain commit

[Gelonida <gelonida@gmail.com>]

Hi,

I noticed, that this post never arrived :-( . So here again.



We have a git repository, whose size we want to reduce drastically due
to frequent clone operations and a slow network connection.


The idea is following:

* archive the git repository just in case we really have to go back in
history.


create a new git repository, which shall only contain last month's activity.

all changes before should be squashed together.
It would be no problem if the very first commit remains unmodified.


I made some attempts with
git rebase -i


but I always encounter errors.
Example error is a cherry pick which can't be applied.


Is git rebase the correct way to delete en entire history section or are
there smarter ways to do this? (e.g. create a new repository with last
months state as starting point and some 'magic' to replay from this
point on with all branches and merges_



thanks for any suggestion.