How to back up Signal conversations

Signal is built for privacy, and its backup system reflects that priority. Unlike WhatsApp or iMessage, Signal does not sync your message history to the cloud by default. This means your conversations are protected from unauthorized access, but it also means preserving them requires deliberate action. If you need Signal conversations as records - whether for personal reference, documentation, or legal purposes - here's what the platform offers and what workarounds exist.

Signal's design philosophy and what it means for records

Signal stores messages locally on your device. Messages are encrypted end-to-end during transit and encrypted at rest on your phone. Signal's servers do not retain message content after delivery. There's no server-side archive to request, no data download tool like Facebook or Google offers.

This is a feature, not a limitation, from Signal's perspective. It means there's no central repository of your conversations that can be subpoenaed, hacked, or handed over. For people who need secure communication, this design is the point.

For people who need records, it creates a specific challenge: if you lose your phone without a backup, your Signal conversations are gone. There's no way to recover them.

Android: encrypted backups

Signal on Android offers a built-in backup feature. Go to Settings > Chats > Chat backups. Enable backups and Signal generates a 30-digit passphrase. Write this passphrase down and store it somewhere safe - without it, the backup is unreadable.

Backups are saved to your phone's local storage as an encrypted file. You can find the file in your phone's file system under the Signal folder. From there, you can copy it to cloud storage, a computer, or an external drive.

Key details:

• Backups include all messages, media, and stickers.
• Backups are encrypted with your passphrase. Signal cannot decrypt them for you if you lose the passphrase.
• You can set automatic backup frequency (daily is recommended if your conversations are important to preserve).
• Backup files can be large if you have a lot of media. Monitor your storage.

To restore from a backup, install Signal on a new Android device, and during setup, it will prompt you to restore from a backup file. You'll need the backup file on the device and the 30-digit passphrase.

iOS: no local backup option

Signal on iOS does not offer a comparable backup feature. There is no built-in way to export or back up your Signal message history on an iPhone.

Signal messages are excluded from iCloud backups by design. Even if you back up your entire iPhone to iCloud or to a computer via Finder, your Signal messages are not included in that backup.

The only way to transfer Signal messages from one iOS device to another is through Signal's device-to-device transfer feature. During setup on a new iPhone, Signal can transfer your message history directly from your old iPhone if both devices are present and connected to the same Wi-Fi network. This is a transfer, not a backup - once complete, the data exists on the new device but no backup copy is created.

This means: if your iPhone is lost, broken, or reset without performing a device-to-device transfer first, your Signal messages on iOS are unrecoverable.

Transferring between devices

Android to Android: Use the encrypted backup method. Create a backup on the old device, transfer the backup file to the new device, install Signal, and restore during setup.

iOS to iOS: Use Signal's device-to-device transfer. Both devices must be present, both must have Signal installed, and they must be on the same Wi-Fi network. The transfer happens over a local connection, not through the internet.

Android to iOS or iOS to Android: Signal does not support cross-platform message transfer. If you switch between Android and iOS, your Signal message history does not come with you. This is a hard limitation with no official workaround.

Manual documentation methods

Given Signal's backup limitations, especially on iOS, manual documentation may be necessary if you need to preserve specific conversations.

Screenshots. The most straightforward method. Scroll through the conversation and capture screens. Note that Signal has an optional "screen security" setting that blocks screenshots within the app. If this is enabled, you'll need to disable it in Signal's privacy settings before taking screenshots. Also note that the other person receives no notification when you screenshot (Signal does not have screenshot detection).

Transcription. For conversations where you need searchable text rather than images, manually transcribing messages into a document preserves the content in a workable format. Include the sender, timestamp, and exact message text for each entry.

Photos of the screen. If Signal's screen security is enabled and you can't or don't want to disable it, photographing the phone's screen with another device captures the content. The quality is lower than a screenshot, but the information is preserved.

Note-taking in real time. For ongoing conversations where you anticipate needing records, consider keeping a running document where you note key messages as they occur. This is less comprehensive than a full export but captures what matters without relying on after-the-fact reconstruction.

Disappearing messages and their impact

Signal's disappearing messages feature deletes messages from both devices after a set timer - ranging from 30 seconds to four weeks. If a conversation has disappearing messages enabled, your window for preservation is limited to the timer duration.

You can check whether disappearing messages are active in a conversation by looking at the conversation header. If a timer icon appears, the feature is on. The duration is shown in the conversation settings.

If you need to preserve messages from a conversation with disappearing messages enabled, do it before the timer expires. Once messages disappear, they're gone from both devices and there's no way to recover them.

It's also worth noting that either party in a conversation can enable disappearing messages. If the other person turns it on, your messages will disappear according to their timer setting, even if you'd prefer to keep them.

Practical recommendations

If you use Signal on Android, enable encrypted backups and store copies of the backup file in at least two locations outside your phone. Test the restore process before you need it.

If you use Signal on iOS, accept that comprehensive backup isn't available and adopt manual preservation methods for conversations that matter. Screenshot or transcribe key exchanges as they happen rather than planning to export later.

For documentation purposes, combine Signal records with records from other platforms into a single timeline. Tools like Receipts can help organize manually captured Signal content alongside automated exports from other messaging apps.

If someone suggests moving a conversation to Signal specifically because messages "disappear," that choice is itself information worth noting, regardless of whether you agree to the platform switch.