vzbackupsync existing backups are no longer shown for the node:
C:\Users\Administrator>vzarestore -l Show existing backups... No backups found.
Outdated PVA Agent is installed on the node.
Reset the backup folder for the node:
C:\Users\Administrator>vzabackup --view-folder localhost path = C:\vz\backups login = C:\Users\Administrator>vzabackup --set-folder --backup-folder-path C:\vz\backups localhost
Resetting the backup folder to the same location will rescan all existing backups.
In order to permanently solve the problem update the PVA Agent on the node to the latest build. You can confirm the latest build number and find installation instuctions in the following article: