Backup of backup - how to get latest state of urbackup backups

Hi,

I run urbackup in Linux container, backing up several Windows workstations to the server.
I have backup script generating offsite backup 1x/week and I would like to include latest status of workstations backup to offsite one.
For file backup, one can simply copy files over but how can it be done for images?

I tried to decompress the backup but it worked only in original backup directory. But that’s not good as then urbackup stays decompressed, taking a lot of space. When I copied the image backup over to temporary directory, decompress failed.