*<explain zip file input here>*ownCloud can store old versions of files when they are updated with a new version. This is a setting the that effects the entire ownCloud instance, it cannot be used on a per user basis. By default versioning is enabled. In this example it has been unchecked. Reason? Well first ask the question, how important is it to keep backup copies of files in the first place? It might be in a business environment on a shared directory. But for a home environment it might not be important. Remember each new updated file uploaded in to ownCloud creates a copy of the old file. , it all chews up disk space. The ownCloud instance might not have the luxury of additional storage space. Additionally who ever takes care of the ownCloud system will have to keep watch who it is using up all of the system disk space.