I have been a paying member for the last 3 months. So I have downloaded lots of full shows.

If I cancel my membership do I get to keep all the full shows I downloaded in the 3 months? Also do I need to back them up on my PC or will I be able to login with the same user name and password and re download them all at any time?

Also If rejoin again at a later time will I only get new full shows and not the same full shows I already downloaded in the past membership?

1, You get to keep what you've been given.
2, Always a good idea to take backups, but you also can download over and over again.
3, Since you keep your cards you don't get them again (as long as you use the same username *s*)