When exactly is stock reserved during the Magento order process?
If a client is placing an order on your store when does the stock against the products they are ordering get reserved? The answer is simple the stock is reserved when the order goes into the 'pending' order status. This means that the stock level for the products will be reduced and allocated to the order.
Old blog post - information is likely to have been superseded.
Backing up your Magento store at the most basic level.