The Implementation Regulations for Archives Stored on Microfilm Article 21

Microfilms shall be inspected periodically. If there is any change or damages, they shall be restored. If they cannot be restored, the whole roll (film) shall be discarded and they shall be reproduced. If they cannot be reproduced, this situation shall be specified on the archives catalogs. The reproduction of Microfilm Master shall comply with Articles 3 to 6 and Articles 8 to 19. The destruction of the discarded microfilms under the first paragraph shall comply with Article 13 of the Retention Period and Destruction Regulations for Agency Records enacted by the central archives authority-in-charge.
中文原文 檔案微縮儲存管理實施辦法第21條
微縮片應定期查驗,如有變質、損壞,應為適當之修復;無法修復時,應整捲(片)作廢,重行製作;無法製作時,應於檔案目錄註記。
微縮母片重行製作時,應依第三條至第六條、第八條至第十九條規定辦理。
第一項作廢微縮片之銷毀方法,準用檔案中央主管機關訂定之機關檔案保存年限及銷毀辦法第十三條規定。

English translation for reference only; the Chinese text prevails. Not legal advice.