Hello all

I am Trying to Design a Formula where i have Custom Picklist Field called ('Months') where it Contains all 12 months name, Now my Requirement is that when Any Month is Selected, Start Date and End Date Should Auto populate based on Month,

Ex - If i Choose Janaury, Start Date and End Date of January Should Auto Populate in the thosed Custom Fields, How Do i Achive this Functionality

For several months I've been using the instructions in this blog post to use Workbench to backup the metadata in my org. Last month, the process stopped working. I assumed it was a one-off oddity and didn't think much of it, but I'm seeing the same errors again this month. Generating the XML "package" containing the metadata I want to export works fine and the process appears to succeed. However when I go to click the download link in Workbench I am told the .zip archive no longer exists. I've uploaded screenshots to show that the ZIP file is generated and the error message displayed when I click the download button. 

I have no idea what I'm doing wrong, and don't believe I've changed anything compared to what I was doing previously, when the backup worked. 

I know there are alternative methods for doing this, such as those discussed here https://developer.salesforce.com/forums/?id=906F0000000BIYzIAO but I am interested in understanding why the method I've been using ceased to work.