Backups with Redo, Deja Dup, & Time Machine

[Coastie]

I read about Redo in www.linuxliteos.com/forums/index.php?topic=1561.msg11043 topic. I use Deja Dup to back up my doc, pictures, .mozilla, .thunderbird, etc. but not my desktop settings. Not sure how or if I should backup my desktop settings. I have used these backups moving up in versions of Linux Lite.

Is Redo just a different or is it a better back up program. If Redo is in the DVD drive will it back up to a separate writable CD drive? How big of a USB would I need? Does it need a separate USB from the one that Deja Dup uses?

I do have an external hard drive that my iMac uses with Mac Time Machine. Plenty of room but I do not know if Redo and Time Machine will share it.

:-\