If your goal is the absolute smallest file size for a long report, use these settings in the 7-Zip "Add to Archive" dialog : : 7z. Compression level : Ultra.
: LZMA2 (best for modern multi-core CPUs). good.7z
: 64MB to 128MB is usually plenty for documents; higher values require significantly more RAM. If your goal is the absolute smallest file
: For text-heavy reports and documents, .7z with the LZMA2 algorithm can often shrink files to a fraction of their original size, far outperforming ZIP. : 64MB to 128MB is usually plenty for
: It treats multiple files as a single continuous block, which is highly effective if your report consists of many similar documents or revisions.
: Solid (this helps if you are archiving many related documents). Does 7z compress better than zip? - Microsoft Community Hub