A dated, complete copy of the official program page and FAQ, the application confirmation and receipt, the payment records and any correspondence, so that the terms relied on can be shown later if the published terms change.
Preserve the terms you relied on
Programs administered under an executive framework can change their published terms, and an applicant who paid under one description may need to show later what that description was. Save the official page and FAQ as dated files, not just bookmarks, including the fee, gift amount, family terms, the immigrant categories named and the stated processing expectations. Keep the application confirmation, the receipt number the official page says will be issued, and every payment record showing the recipient account and the amount. Keep the wire instructions and confirm them by a second channel before sending any gift payment, because large payments to a government account are a target for fraudulent redirection. Store the applicant's own vetting submission in full. If a lawyer or adviser is involved, keep the engagement letter and their written advice. This record is not for USCIS; it is for the applicant, in case the terms or the process are later disputed.
Hypothetical example: a boutique-hotel owner saves the program page as a screenshot but not the linked payment instructions or FAQ. The first review should create a dated record of every official term, each confirmation and the source of every payment instruction. The official receipt and a verified government payment channel settle what was paid and to whom. Confirm any wire destination independently before transfer, preserve the complete submission package, and do not rely on a consultant's copy of a changing webpage when a question later arises about the program terms.