skunksarebetter#ZPAQ is an #publicdomain incremental, journaling compressor.
zpaq is an archiver for incremental additions, where new files detected in a directory tree are added to an existing archive. zpaq can extract specific versions of files, encrypt archives, as well as rollback to remove additions, and duduplicate blocks to improve compression. zpaq has an official specification and #Cpp #library.
Website 🔗️: http://mattmahoney.net/dc/zpaq.html
apt 📦️: zpaq