: Most likely utilizes LZMA or LZMA2 , which offers significantly higher compression ratios than standard ZIP or GZIP formats.
: Automated backups of server contents or SQL databases.
: Supports files up to 16,000,000,000 GB in size and allows for "solid" compression, where multiple files are compressed as a single data stream to increase efficiency.
: A specific build or version of a project exported from a version control system.