this is a known error and the fix is already in the testing phase. I will let you know when it will be available for download.
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Disk Image Transfer requires RHV to be in version 4.3+. For version 4.2 you can only use the disk attachment strategy which gives you the possibility to do only full backups. This strategy also requires having a node installed inside the RHV cluster as a proxy vm.
@Cristian-Eglue Yes I can see thank you. So in this configuration, you set 7 days and 14 versions to keep, but your scheduler is configured to make a backup every day. So after a week, you have 7 backups but you also set a time restriction so backups older than 7 days will be marked as expired and removed after the next backup cleanup job so you only get 7 versions, not 14. nevertheless, you should be able to restore from any of those 7 versions.