Online Sync

Online sync mirrors your Bluecoins database to a cloud provider of your choice, giving you:

• instant access on any device logged into the same cloud account,
• safe reads on multiple devices (and family sharing), and
• a second copy off-device.

Setup

1. Install Bluecoins on the primary device, enter all your data.
2. Open Settings → Online Sync.
3. Connect your Google Drive, Dropbox, or OneDrive account (the app requests scoped permissions: create/update files it owns, never full Drive access).
4. Choose Upload. Bluecoins uploads a single file (typically under 3 MB unless you store many attachments).
5. On any other device, connect the same cloud account and choose Download.

Multi-user sharing

Family members can each run Bluecoins on their own phone against the same cloud file. Uploads are serialized per device and a conflict message appears if two devices write simultaneously — re-download and continue.

Why a dedicated cloud backend

Bluecoins does not host your data on its own server: no monthly fee, full ownership, and your data never leaves the cloud account you chose. The offline (phone) copy is the source of truth; the cloud file is the sync channel.

Notes

• The same file must be used on all devices — configure Upload on one and Download (not a new Upload) on the others.
• Attachments are uploaded separately with a background worker and sync lazily.
• See Settings → Online Sync for the walkthrough, and the FAQ entry about Google/Dropbox/OneDrive connection issues.

Backup

Local backups complement sync: the app can schedule daily backups to device storage (Settings → Data → Phone Storage). See Data Management.