Reading Time: 2 minutes Using Veeam Endpoint you learn a lot on how Microsoft VSS works and how you can solve problems when something stop or go wrong. Some months ago I’ve wrote about an issue in file exclusion (see Veeam Endpoint: unable to exclude files from shapshot). One week ago, Veeam Endpoint backup jobs goes in a yellow state again with this message: 05/01/2016 00:32:17 :: Unable to exclude files from snapshot: Shadow Copy Optimization Writer timed out (see Windows event log for more info).