Save estimate versions

It would be incredibly helpful to be able to save versions of estimates.

for example everytime I send a proposal, I would want to save a snapshot of the estimate. that I could revert back to.

We might do multiple estimate revisions before we get to contract.

currently I have to make a copy each time and the proposal details dont always copy over.

It would be nice to just save a snapshot each time.

The ability to automate some snapshots would be great., ie everytime a proposal is sent a snapshot is made.

Anytime a proposal is accepted a snaphot is made.

etc