Simple, reliable, automated S3 uploads for Android.
About this app
The exfilac application is a simple application that aims to do one thing well: Get data out of Android devices and into S3 buckets.
Features:
- The application can work with any S3-compatible storage provider. This includes Amazon AWS, Vultr Object Storage, IDrive®, and many other commercial offerings. Additionally, the application can work with self-hosted S3 storage solutions such as MinIO. - The application can (recursively) upload the contents of any directory on an Android device to which it has been granted access. The set of directories is configurable. - The application conserves precious bandwidth by avoiding uploading files that already exist on the remote storage. The cryptographic hashes of files are computed locally and files are only uploaded if the hashes of the files on the remote server do not match. - The application can be configured to upload files on a timed schedule, and/or in response to various events occurring on the device such as a photo being taken, or the network becoming available. - The application vigorously respects the privacy of users: The application contains no telemetry or analytics of any kind, and never collects any user data. - Development of the application is performed in the open. The complete source code is made available under an extremely liberal ISC license, and development and bug tracking is handled in a public GitHub repository. - The application rejects bug-prone Android programming practices and libraries and instead strives for correctness and stability using battle-hardened, well-tested components designed outside the traditional Android ecosystem. - The application adopts a cautious development approach and does not pursue huge sets of complex features. The application attempts to adhere to the Unix philosophy and provide a simple, sharp tool that does one thing well. - The application attempts to respect the intelligence of users. Technical details of many aspects of the system are clearly displayed onscreen, and important information is not hidden in the misguided pursuit of "user-friendliness". - The application is comprehensively documented.
Licensed under ISC, by Mark Raynsford.
What's New in v1.1.4
Imported from the F-Droid repository index.
Version history
Dec 21, 2024 · 18.3 MB · Android API 26–34 · code 1104
Imported from the F-Droid repository index.
SHA-256 5cca213c90f70c83d1f62895bafb400ed35bd6084478eadebc6d6b2d5bb135c1
Nov 7, 2024 · 18.3 MB · Android API 26–34 · code 1103
Imported from the F-Droid repository index.
SHA-256 427e191737372894fd2b9eebc7443b76f61b4e0f5baa58fdde59e12a0efda9d2
Oct 25, 2024 · 18.3 MB · Android API 26–34 · code 1102
Imported from the F-Droid repository index.
SHA-256 6b9ba0b73c7a894a3c2e64bc151103133e91f7ef99b7738ec1a04c442576dff0
Will it run on your device?
87%
- Runs on a broad range of modern Android versions.
- Multiple CPU architectures are covered.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be com.io7m.exfilac.main is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
If the current release misbehaves, 1.1.3 is the last build before it. Android will not install an older version code over a newer one, so you must uninstall Exfilac first — which clears its local data unless you have a backup. Reinstall the older APK only if its signing fingerprint matches the build you already trust, and check the API range: an older release may target an Android version your device has moved past.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Exfilac, and a listing is removed when the evidence for it stops holding up.
Get Exfilac
Every source we list for com.io7m.exfilac.main is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
5cca213c90f70c83d1f62895bafb400ed35bd6084478eadebc6d6b2d5bb135c1
Signing certificate
888ffca70ad0c128c05e67794e06f056cacaa2049c97fcbb9bdbba9c3d3d63b5
Permissions Required
Previous Versions
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
Report a problem with this listing
A listing is only as good as its corrections. If a source is broken, a signature looks wrong, or this app should not be here, tell the moderation team.