I see that zoho invoicing is a cloud based system which very useful. However, since I am in the process of integerating it to my business, I want to know if we can use it incase there is a temporary unavailability of internet due to unforseen circumstance. So, can your system be used in "Offline Mode" to create invoices without net access, and synchronise again when net becomes available? since, our business cannot stop even if internet goes down for a while.