I think you can download all the content, though. Pretty easily, IIRC. (I just downloaded my FB “friends” list - didn’t need anything else)

And set up over at Gab, and just throw out the invitation to your FB friends to join you now, or later.

But don’t let yourself get ^further* tied to a malignant tumor like FB. Rescue your content the best you can now, because it’ll be gone sooner or later, and maybe when you least expect it).