Some external tool assignments, like Gradescope, Peerceptiv, Office 365 may need to have their links updated when copying the course over.
Copying and pasting lists of file links from one course to another will break those links. A best practice to follow is to use the course copy or import tool to copy files from one course to your other course, instead of copying and pasting the link.
To adjust assignment due dates for holidays, or other days there will be no class, use the bulk update due dates and availability dates feature in Canvas to update multiple assignments and assessments at one time.
Use Reset Course Content if you are planning to import all existing content from your previous Canvas course to your new course shell.
An exported quiz with questions linked to a question bank will not include an export of the question bank. If you want to import the quiz into another course along with question banks, you may prefer to import specific content and select Question Banks.
How do I export a Canvas course?
How do I copy all content from another Canvas course using the Course Import tool?
How do I select specific content as part of a course import?
How do I import a question bank from one Canvas course to another?
How do I export quiz content from a course?