Hi,
the comment is part of the backups snapshot manifest and contained in the response when listing snapshots, e.g. by
Code:
proxmox-backup-client snapshot list --output-format json
(you can also use json-pretty if you want a human readable output)
or via the corresponding api endpoint [0]. So you could create a small script filtering out snapshots using this.
The comment you will also see in the WebUI when listing snapshots of a datastore, so that might help to find the snapshot you are looking for as well, if you have access to the WebUI.