I would like to know how to do it in version 3.1.3. In version 2.0.5 it was very easy but in 3.1.1 I can’t find that option.
Beforehand, Thanks
I don’t think that option is around any more. People had enough trouble with ordinary Projects I can see where adding compression tasks to the mix wouldn’t go well. Using Audacity Projects as archive or backup storage alone is not recommended. Use WAV (Microsoft) sound files as backup/archive alone or in addition to a Project.
Koz
Audacity 3.x has an option to create a backup copy of the project. See: https://manual.audacityteam.org/man/file_menu_save_project.html#backup_project
To save disk space, you can ZIP the backup project after saving - typically that can reduce the project file size to about half.
You will need to extract the project from the ZIP file to work on it.