Level 4

Account management

Here's your options:

Your accountant would need QB 2015 -- if you send him a backup file, then you can't work on the file while he has it -- i.e. there is one master file.

Your accountant could login remotely to work on your QB file but you can't use the computer at the same time.

You could switch to QB Online then you and your accountant share the data and can work in the company at the same time.  Plus you can enter transactions from the mobile app and it syncs with QBO -- like an expense and take a pic of the receipt.

I hope this was helpful.