NukoSync ("the app") is an Android app that backs up and syncs files between your phone and
your own NAS or PC, developed by Nuko ("we", "our"). This page explains what data the app
handles — and what it does not collect.
Short version
Your files travel only between your phone and the servers you register yourself (a NAS, a PC
and so on); they are never sent to us (we do not run any server). Server settings, passwords
and the transfer history are stored only on your device. The free version shows ads, so
Google's ad SDK (AdMob) handles data such as the advertising ID (details below). The Pro
version (one-time purchase) shows no ads.
How your files are transferred
Destination: files are sent to and received from only the servers you register,
directly, using the protocol you choose (SMB, SFTP, WebDAV, FTP/FTPS). Whether the
connection is encrypted depends on the protocol and your server (SFTP, HTTPS and FTPS are
encrypted; plain FTP and HTTP are not, so use them only inside your home network).
Files on the phone: the app reads and writes only the folders and files you pick in
Android's folder/file picker. It does not use the "all files access" permission.
Photo locations: to copy photos and videos with the place they were taken (location
metadata such as EXIF) intact, the app asks for access to photo locations. The location travels
only as part of the file to your own server and is never sent to us. The app does not read or
store locations outside the files, and never uses your device's current location. If you deny
it, the copies simply lose their location; everything else still works.
Network check: before a scheduled run, the app briefly checks whether the server can be
reached and whether the phone is on the same network (subnet), and skips the run when you are
away from home. It does not use the Wi-Fi name (SSID) or your location.
What is stored on your device
Server settings: host name, port, share name, user name, and the host key fingerprint
of SFTP servers.
Passwords: encrypted with a non-exportable key held by the Android Keystore.
Jobs and history: job settings, and the names, sizes and modification times of
transferred files with the result of each run. They are used for copying only changes and for
resuming interrupted runs.
This data is excluded from Android's cloud backup and is deleted when you uninstall the app.
Settings export (Pro): server and job settings are written only to the location you
choose. If you choose "Include passwords", they are written to the file as plain text, so
keep it somewhere safe.
Advertising (free version)
The free version shows a small banner ad from Google AdMob. AdMob may collect and use the
advertising ID, device information and approximate location (inferred from the IP address)
to serve and measure ads and to prevent fraud. Users in the EEA, the UK and similar regions
are asked for consent through Google's User Messaging Platform, and can change it at any
time from "Ad privacy settings" in the app menu. See
how Google uses information from apps that use its services.
You can reset or delete the advertising ID in your device settings.
In-app purchase
Purchasing Pro is handled entirely by Google Play. Payment details never reach us.
Permissions
INTERNET: to talk to your servers, and for ads and the in-app purchase.
ACCESS_NETWORK_STATE / ACCESS_WIFI_STATE: to honor the "Wi-Fi only"
condition and to keep Wi-Fi at full speed during a transfer.
FOREGROUND_SERVICE_DATA_SYNC / WAKE_LOCK /
POST_NOTIFICATIONS: to keep a transfer running with the screen off, and to show
its progress and result as a notification.
ACCESS_MEDIA_LOCATION: to keep the location metadata of the photos and videos being
copied (see "Photo locations" above).
The app has no current-location, camera, contacts or all-files-access permission.
What we do not collect
Your files, their names or their contents
Server addresses, user names or passwords
Personal information such as your name or e-mail
Usage analytics or crash reports sent to us
Children's privacy
The app is not directed at children under 13 (or the relevant age in your country) and
does not knowingly collect information from them.
Changes to this policy
If this policy ever changes, this page will be updated and the "Last updated" date above
will change accordingly.
Contact
Questions about this policy or the app can be sent to: