Syntax

save
save <project> [as <newPath>]

save project "My Project"
save project "Accounting" as "/Volumes/Backups/Accounting"

Explanation

Save changes to all currently open projects, or to the one specific project specified as the first argument.

If you specify the as parameter, the project will behave like the usual “Save as…” command and save a copy of the specified project at the given newPath. If the path doesn’t contain the correct filename extension, the .xstk extension will be appended automatically.