After the build · Start Your Server

Features set up for you. The plan page lists every feature the build configured, ready to try. If one needs a finishing touch (usually a channel), it is flagged with exactly what's missing.
Undo and backup. Download backup saves the pre-build snapshot as a file, and Undo build recreates your previous structure. Restored channels come back empty: Discord cannot restore deleted messages, which is why deletions ask for explicit confirmation.
Save it as a template. Like the result? Save this design as a template keeps it under Your templates for the next server, and you can share it to Community templates (your Discord name shows as the author, and you can make it private again any time).
Keep refining. The conversation stays open. Ask for changes any time and build again; repeat builds only apply what's different.