BorgBackup
From Just Solve the File Format Problem
BorgBackup, or borg for short (previously Attic), is a deduplicating backup program with optional compression and authenticated encryption for Linux, Mac OS X, *BSD, Cygwin and Linux Subsystem of Windows 10
Optionally, borg can actively obfuscate e.g. the size of files / chunks to make fingerprinting attacks more difficult
Available compression algorithms are lz4, zstd, zlib and lzma and encryption is AES
Archives are mountable as userspace filesystems for easy interactive backup examination and restores
