I use the free version of XSI-Backup-DC (126.96.36.199).
I created and executed a backup job using the GUI. Works great. I also added a cron job for this backup. But what kind of backup is carried out now? Full backup? Incremental backup? I assume an incremental backup is being performed. But from what stand. Is a full backup performed the first time and then only incremental backups? If so, why is each incremental backup close to 350MB even though it has not been changed?
CBT feature is not available to Free version. A checksum based incremental backup is dome instead, which takes much longer, specially on bigger VMs.
An OS that is switched on always generates changes, logs per instance. Just a changed bit will trigger the copy of that whole block (1MB by default).