There is no Upper or Lower limit for bandwidth defined in Enjay E-Sync. 

It will use what ever is available to it. But it would be best practice to manage this using off-peak times, so that bandwidth management is optimized.

For example, generally in offices storage or internet is not used in night time, you may configure E-Sync to sync data @ night time, or Lunch time.

Feel free to talk to Enjay's Technical Expert to guide you for the same.