vitalesafe.com

The size safe you need will depend on what types of files you will be uploading.  Files such as Word and Excel are typically small, maybe less than 50,000 bytes (50k).  On the other hand, digital photographs can be in the 2 to 5 million byte range (2 to 5 MB).

You can increase or decrease the size of your safe at any time, so this decision shouldn't worry you.  The table below gives you an idea of how much space it takes to store some typical file types.