Reducing .vbk/.vib combined files size of backups not connected to any job anymore?

[grokit]

Due to a change in the backup structure (vCenter replaced by direct access to vmware host), I had to setup all backup jobs again.
The backup chain gets broken due to the change of the infrastructure.
The old vCenter does not exist anymore, the old backup jobs are still there, but disabled.

Now I have plenty of .vbk and .vib files from about six VM's in the repository, that are not connected to an active backup job.

How can I "consolidate" or rather reduce the sizes of those .vbk and .vib files? Is there a way to do a synthetic fullbackup or something similar to reduce the combined file sizes?
I only need one fullbackup per VM.

For example, I have for a particular server the following properties when I look in Backup Disks:
Name,Data Size,Backup Size,Deduplication,Compression,Date
YMSERVER D2018-10-09T190052.vib,25.8GB,10.6GB,1.0x,2.4x,09.10.2018
YMSERVER D2018-10-07T192007.vbk,600GB,288 GB,1.2x,1.8x,07.10.2018
YMSERVER D2018-10-02T190034.vib,32.2GB,11.3GB,1.0x,2.9x,02.10.2018
YMSERVER D2018-09-30T192347.vbk,600GB,287GB,1.2x,1.8x,30.09.2018

I actually only would need the fullbackup from 7.10.2018 combined with the incremental of 9.10.2018
(in other cases, I might have up to 6 .vib files)

Which ways could I go to achieve what I need?

Help is appreciated.
Thanks.
Daniel

[foggy]

Hi Daniel, if you do not need older backups, you can remove them manually (or wait until the new jobs reach the required number of restore points, if you're not short on space).

[grokit]

hi @foggy,
I would like to keep them.
any way to reduce the size?
daniel

[foggy]

No, you cannot do this outside the job.