by Colin Fraser.
As far as file upload, you can change it to whatever size you want, essentially, but anything much bigger than 512MB can take a bit long. If you are going to change file upload size then use the same size for post_max_size as well - keeps them balanced. Also, while there, you might want to reset memory_limit to 256MB, I've always done it and yet to run into an issue with it. The other issue that might affect is max_execution_time. Never had an issue with this but the default is 240, you might want to set that to 300 - that's 5 minutes which should be long enough to execute any script.