How to Automatically Back Up Android Photos to Your NAS (SMB / WebDAV / NFS)
Your NAS is already a file server. This guide shows which protocol to use from Android, how to set it up on Synology, QNAP, or TrueNAS, and how the main backup apps compare.
On Android, photos can back up to a NAS automatically: Pho connects to the SMB, WebDAV, or NFS service your NAS already runs and uploads in the background, with nothing installed on the NAS. The alternatives differ in scope. FolderSync ships for Android and Desktop only, with no iOS app [claims:foldersync-android-only]. PhotoSync has an iOS app, but its official documentation states: Autotransfer on iOS supports only the options “Location-Based Transfer” and “When Charging” (iOS 13). [claims:photosync-autotransfer] On Android, its NAS transfer is a paid add-on [claims:photosync-android-addon].
Why Android background upload breaks
Android treats background work as a privilege, not a promise. Doze mode and App Standby defer app jobs when the phone is idle, and the platform batches background execution so no app runs continuously. A photo uploader that misses its window waits for the next one instead of failing.
Manufacturer battery managers make this stricter. Several Android vendors layer their own task killers and auto-start restrictions on top of the platform rules, so an app can be installed and configured correctly and still be suspended once the screen turns off, until the user exempts it from battery optimization.
There is also a connectivity gate. Android lets you restrict background data to Wi-Fi, and the system may pause transfers on a metered connection. That is usually what you want for a large photo library, but it means the first bulk upload should run on Wi-Fi with the phone on a charger.
None of this breaks the workflow; it only changes the timing. Pho runs a periodic background sync timer on Android, and the same sync engine also runs while the app is open. After the first full upload, the daily increment is small and finishes quickly. If uploads stall, check three things: the battery optimization exemption for the app, background data allowed over Wi-Fi, and that the NAS share is reachable from the phone's current network.
Keep the first upload on Wi-Fi and on the charger
Doze mode can suspend a long transfer as soon as the screen turns off. Leave the phone plugged in with the app open until the first full library upload finishes; later incremental syncs are small enough to complete in a single background window.
If the NAS is already running, you do not need to change anything on it. The companion guide on backing up photos to an existing NAS covers the same direct-to-share approach from the storage side.
SMB vs WebDAV vs NFS on Android
The phone does not mount a network drive at the operating system level. The backup app implements the protocol itself, so the only requirement on the NAS side is an enabled file service. The matrix below lists what each protocol needs and where it works best.
| Protocol | Typical support on NAS | Authentication | Best for | Remote use |
|---|---|---|---|---|
| SMB/CIFS | Built into Synology DSM, QNAP QTS, TrueNAS, OpenMediaVault, unRAID, plus Windows and macOS shares | Username and password (NTLM) | Simple backup on your home network for every NAS brand | Through a VPN such as WireGuard or Tailscale |
| WebDAV | Server package on Synology and QNAP; built into Nextcloud, ownCloud, and many Linux NAS setups | HTTP Basic auth over TLS | Backing up when you are away from home without a VPN | Works over HTTPS with a reverse proxy |
| NFS | Linux-based NAS and servers: TrueNAS, OpenMediaVault, unRAID, most Linux distributions | Host-based AUTH_UNIX, designed for trusted networks | Fastest transfer on a trusted local network | VPN only |
Which one should you pick?
For a first Android setup on a home network, choose SMB: it is already enabled on nearly every consumer NAS and takes a host, a share, a username, and a password. Add WebDAV if you want backups to continue when you are away from home without a VPN, and use NFS only on a trusted local network where the NAS runs Linux.
One protocol gap is worth knowing when you compare apps: Pho speaks NFS natively, while PhotoSync's official protocol list contains no NFS [claims:photosync-no-nfs].
Step-by-step: Synology, QNAP, TrueNAS
Menu names differ by vendor, but the shape of the setup is always the same: enable a file service, create a folder and a user for the phone, then enter those details in the app once.
Synology DSM
- Open Control Panel > File Services > SMB and enable the SMB service.
- Open Shared Folder and create a folder for photos, for example "Photos".
- Edit the folder > Permissions and grant your user Read/Write access.
- In the app, enter the NAS address, the share name, your username, and your password.
- For backups from outside the home, enable the WebDAV Server package as well; Synology uses port 5006 for WebDAV.
QNAP QTS
- Open Control Panel > Shared Folders and create a shared folder for photos.
- Open Control Panel > Network & File Services > Win/Mac/NFS/WebDAV and enable Microsoft Networking for SMB.
- Grant your user read/write permission on the folder in the shared folder permissions.
- In the app, enter the NAS address, the share name, and your credentials.
- For WebDAV, enable the WebDAV server and use the port shown on its settings page.
TrueNAS (CORE and SCALE)
- Open Storage > Datasets and create a dataset for photos.
- Open Sharing > SMB and add an SMB share pointing at that dataset. On CORE the same screen is called Windows (SMB) Shares.
- Open Credentials > Local Users, create a user, and grant it access to the dataset.
- In the app, enter the NAS address, the share name, and your credentials.
- For NFS, use Sharing > NFS to export the dataset to your local network, then enter the host and export path in the app.
Nothing has to be installed on the NAS for any of these steps. If your household also has iPhones, the iPhone-to-NAS sync guide walks through the same protocols from the iOS side.
FolderSync vs PhotoSync vs Pho
Both FolderSync and PhotoSync come up in every Android photo backup list. The table below is deliberately narrow: every competitor cell is limited to facts verified against the vendors' own documentation on 2026-09-24.
| Dimension | FolderSync | PhotoSync | Pho |
|---|---|---|---|
| Runs on Android | Yes, Android app with a Desktop app alongside it [claims:foldersync-android-only] | Yes, Android app; NAS transfer requires the paid NAS Add-On [claims:photosync-android-addon] | Yes, native Android app |
| Runs on iPhone | No, Android and Desktop only, no iOS app [claims:foldersync-android-only] | Yes, iOS app [claims:photosync-autotransfer] | Yes, native iOS app |
| Automatic transfer on iPhone | Not available, no iOS app [claims:foldersync-android-only] | Autotransfer on iOS supports only the options “Location-Based Transfer” and “When Charging” (iOS 13). [claims:photosync-autotransfer] | Background sync runs automatically after the first setup |
| NAS protocols from the mobile app | Android and Desktop only, no iOS app [claims:foldersync-android-only] | SMB, WebDAV, (S)FTP; Synology, QNAP, WD, TrueNAS, OMV [claims:photosync-protocols] | SMB/CIFS, WebDAV, NFS, S3-compatible object storage, Google Drive, Baidu Netdisk |
The scope above is intentionally small. For a wider app comparison, including server-based platforms such as Immich, PhotoPrism, and Nextcloud, see the best NAS photo backup apps for iPhone and Android.
FAQ
Install a backup app on the phone and point it at a share on your NAS over SMB, WebDAV, or NFS. The app speaks the file-sharing protocol your NAS already runs and uploads new photos in the background. No server software, virtual machine, or container is required on the NAS.
Yes, but Android decides when the work runs. Background jobs are batched into scheduled windows instead of running continuously, so a photo can wait for the next window. Pho runs a periodic background sync timer on Android, and keeping the app exempt from battery optimization makes those windows more reliable.
SMB is the best default for most people: it is already enabled on nearly every consumer NAS and works on the local network with a username and password. Choose WebDAV when you want backups to continue over the internet without a VPN, and NFS for Linux-based NAS on a trusted local network where you want maximum throughput.
No. The sync engine is compiled into the Pho app itself and connects directly to the file service your NAS already runs. Your NAS only needs SMB, WebDAV, or NFS enabled, which is usually a single toggle in its admin panel.
No. FolderSync ships for Android and Desktop only, with no iOS app [claims:foldersync-android-only].
PhotoSync's official documentation states: Autotransfer on iOS supports only the options “Location-Based Transfer” and “When Charging” (iOS 13). [claims:photosync-autotransfer]
No. On Android, PhotoSync's NAS transfer requires the paid NAS Add-On [claims:photosync-android-addon].
Yes. Photos are stored as untouched originals in date folders such as YYYY/MM/DD, with thumbnails mirrored in a .thumbnail folder, so any file manager or NAS app can read them without Pho.
Ready to back up Android photos to the NAS you already own?
Download Pho, point it at your NAS over SMB, WebDAV, or NFS, and let background sync handle the rest.