It's always so great to have first timers! And also great to hear someone will be following along on Pillowfort \o/

Sure, any second place is a site less likely to have things disappear (and also gives them a second chance to be discovered). Also, I feel fairly confident that the DW owners will not suddenly wipe the site or not give its users a chance to back up/preserve their content. So that makes DW a perfectly good choice. (There's also quite a few folks here interested in meta, even if they don't write much).

One thing you may find as you go through your writing is that you have more to preserve than you thought! I know I haven't been the only one to discover this 🙂