What this is. YJPC is a private, single-user application operated by the owner of yjpc.cloud. Its purpose is to copy the owner's own server backups (encrypted archives) to the owner's own Google Drive account through the Google Drive API, and to check that those copies exist. It runs unattended once a night on the owner's server.
Who uses it. Only the owner. There is no sign-up, no other user, and nothing on this domain is offered to the public.
Who operates it. YJ, a solo software developer in Malaysia (company site: simplicityideatech.com). This server hosts his private tooling; YJPC is one of those tools.
Google data it touches. Files that the application itself creates in the owner's Google Drive. It does not read, share, or sell any other data.