GitHub user JoaoJandre added a comment to the discussion: KVM snapshots are not 
being removed

Also @DaanHoogland, the KVM incremental snapshots are never coalesced, as it is 
expected that the chain will end and eventually be removed from storage. The 
coalesce operation is costly in terms of CPU and time; thus, it would bring 
more trouble than benefits; at least that was the decision process during 
implementation. It would be possible to implement coalesce in the future if it 
was deemed a good option.

Just for comparison's sake, Veeam does the same process of keeping old backup 
deltas.

GitHub link: 
https://github.com/apache/cloudstack/discussions/11959#discussioncomment-14857325

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