local

Using True Image Lite 2013 by Acronis Local Nonstop Backup

Synchronization of two local folders on one machine

The "Log on as a service" right failed to be automatically added to the user under which you are trying to install

Provide credentials of the user that has access to the network share on the Agent machine

You are backing up any data to a local drive or a network share of any type. Backup schedule is other than "Always incremental". Always incremental archives are not affected by this issue as this backup scheme produces archives of another type.

At some point when you already have a full backup and create subsequent backups, the process starts failing or producing a warning: "The archive is invalid or its type is unsupported."

Issue can also happen when trying to delete the backup.