In the context of data compression and archiving, "chaining" with files refers to a specific method of combining multiple compression algorithms or tools to improve efficiency or add security.

: By "chaining" with zpaq, users can add only the changes made to files since the last backup, a feature not natively handled in the same way by standard WinRAR operations.

The primary "feature" often discussed by power users involves using —a journaling, incremental command-line archiver—in a chain with RAR archives. This method provides:

: Users leverage the highly efficient zpaq algorithm (known for winning compression benchmarks) to compress data before placing it within a standard RAR container or alongside it.

: In threat intelligence, a "chain" may refer to a multi-stage infection process where a RAR archive acts as the initial delivery vehicle for secondary scripts (like Batch, JavaScript, or PowerShell) to launch malware such as AsyncRat.