This page explains how to backup and restore data on Dropbox iOS app.
The backup function is available free of charge.
Data Backup & Restore on Dropbox
- Open the iOS Dropbox app and tap your data.
- You see "No Preview Available" in the screen.
- Tap the button in the upper right corner and tap the Export.
- Select "Open In..."
- Tap "Open in Taxnote"