Exfilac

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.