We use Dropbox to sync our BandMgr file between devices, but you should be able to use any cloud service I would think. Sugar Still uses a single SugarStill account that we can both log into to share the BandMgr file on both of our MacBooks and both of our iPhones. If you don't know how to use Dropbox you should probably learn, it's dead simple, and super valuable. Google Drive works almost identically to Dropbox now, so either service should work for you. I don't use iCloud, but it could probably be set up to work in the same way as well.

One thing to look out for is that iPhones and iPads currently don't sync in both directions. When you open the BandMgr file on your iPhone or iPad from Dropbox, you have to manually save the file BACK to Dropbox later to get it to sync with your other devices. THIS IS VERY IMPORTANT to know if you're sharing BandMgr between band mates or back and forth between your iPhone and your MacBook. When you open the Dropbox file on your Mac, all the changes are automatically saved to your Dropbox folder, but this is NOT TRUE with an iPhone or iPad. On an iPhone or iPad the changes you make are ONLY saved onto the device itself. If you drop your iPhone in the toilet you may lose any of the recent changes you made on your iPhone, comprende?

Another big thing to understand is that you should only enter or change data ON ONE DEVICE AT A TIME. If you and a band mate enter data simultaneously or you enter data on your iPhone and your Mac without manually syncing the file you may lose data or over-write data you entered on one or the other devices. Coordinate with your band mates so that only one person is using BandMgr at a time. We switch back and forth a lot, but we make sure to send a quick text or Facebook message to each other to make sure the other person isn't using it already, or to ask if they can close the app for a few minutes so we can do what we need to do.

We're building a way to email recent changes as an attachment to aid with syncing data back and forth, but this feature isn't done yet.