: The .7z extension indicates it uses the 7-Zip compression algorithm, which is known for high compression ratios, making it efficient for storing large training models [4]. Common Use Cases
: The "ppCl" likely stands for "Paperless Classification." It contains the trained data used by the system's machine learning algorithm to automatically "classify" documents—assigning tags, document types, or correspondents based on their content [1, 2]. ppCl.7z
: Users often encounter this file when backing up or moving their Paperless-ngx instance to a new server. ppCl.7z