I’m always surprised at how many authors don’t retain a copy of the working files for items that they create.
Often times, we have to ask an author to correct an issue with a project, only for find out the author no longer has access to the files they created. Sometimes its due to hard drive failure, but usually its because the author deleted the files from their computer after approval. (This is a REALLY BAD idea!)
After a file is approved for sale, please do not delete the working files. Instead, store them in an external backup hard drive, or a cloud service such as Dropbox, iCloud, or Google Drive. There are plenty of affordable, high-capacity storage options these days.
If an issue arises in the future – such as the ZIP becoming corrupted, or if something with file needs to be fixed – if you didn’t retain a copy of all files for immediate access, you won’t be able to correct the problem, possibly resulting in the item being permanently disabled.