Are you actually using the delete command (for removing an entire backup run) or the purge command (to remove specific files from a backup)?
Usage:
delete <storage-URL> [<options>]
Marks old data deleted and removes outdated dlist files. A backup is deleted when it is older than or when there are more newer versions than . Data is considered old, when it is not required from any existing backup anymore.
–keep-time=
Marks data outdated that is older than .
–keep-versions=
Marks data outdated that is older than versions.
–version=
Deletes all files that belong to the specified version(s).
–allow-full-removal
Disables the protection against removing the final fileset
Usage:
purge <storage-URL> <filenames> [<options>]
Purges (removes) files from remote backup data. This command can either take a list of filenames or use the filters to choose which files to purge. The purge process creates new filesets on the remote destination with the purged files removed, and will start the compacting process after a purge. By default, the matching files are purged in all versions, but this can be limited by choosing one or more versions. To test what will happen, use the--dry-runflag.
–dry-run
Performs the operation, but does not write changes to the local database or the remote storage
–version=
Selects specific versions to purge from, multiple versions can be specified with commas
–time=
Selects a specific version to purge from
–no-auto-compact
Performs a compact process after purging files
–include=
Selects files to purge, using filter syntax