If you want to sync across devices, Book Keeper uses Dropbox to sync data.
Your data is safe and secure on Dropbox, here are the reasons:
- Dropbox up time is 99.99%, that means your data is available all the time
- Incase you delete your company file, Dropbox stores your company file for 30 days, you can recover your company
- Also, Dropbox maintains version history of your files, that also helps to recover data in some critical cases
- Regarding security, your data is stores in your personal account on Dropbox, so no one can access it without your password.
Learn More: https://www.dropbox.com/security