Be absolutely certain to make the backups, understand the copy procedures, and get the permissions repair done, or you'll likely be doing a system reinstall.

一定要确保做好备份，通晓拷贝的流程，修复权限，否则你很可能需要重装系统。

youdao

Mr Le Ray said work to reinstall the system, which was removed at the end of last year, had been delayed by the weather.

BBC: Fog 'causes disruption' at Guernsey Airport