rsync is written in C as a single-threaded application. The rsync algorithm is a type of delta encoding, and is used for minimizing network usage. Zstandard, LZ4, or Zlib may be used for additional data compression, and SSH or stunnel can be used for security.
rsync is written in c as a single-threaded application the rsync algorithm is a type of delta encoding and is used for minimizing network usage zstandard lz4 or zlib may be used for additional data compression and ssh or stunnel can be used for security