Please also consider adding local backup or sync file support, as this would be a more flexible option for other cloud based service. For example, I'm using amazon drive, and it is a new service and long product in market, it will take time for market to adopt, and it might take longer time for other product to adopt the linkage between their services with amazon driver. However, if Marginnote support backup on and sync with local file, then I can it just put my local backup file in amazon drive folder, which allows me to have remote/cloud sync liked functionality
Please also consider adding local backup or sync file support, as this would be a more flexible option for other cloud based service. For example, I'm using amazon drive, and it is a new service and long product in market, it will take time for market to adopt, and it might take longer time for other product to adopt the linkage between their services with amazon driver. However, if Marginnote support backup on and sync with local file, then I can it just put my local backup file in amazon drive folder, which allows me to have remote/cloud sync liked functionality