After having done a few tests, I would like to delete all backup chains I created with these tests. is it enough to simply physically delete them from the corresponding storage?
To delete all backups, remove everything under the snapshots and chunks folder.
Otherwise, you may need to run the Duplicacy CLI version from the command line and use the prune command with the -exclusive option. The exclusive option assumes no other backups are in progress so it will not invoke the two-step fossil collection algorithm and instead delete unreferenced chunks immediately.
Thanks!