Logging does not seem useful currently (from a user point of view). It would be great to have logging that is useful to us end users.
Here is a brainstorming proposal (inspired by rsync)
> kopia --log-level=help
BACKUP Mention files backed up
MOUNT Mention mounts that were found or skipped
SKIP Mention files that are skipped due to ignore rules
STATS Mention statistics at end of run (including compression)
DEBUG Mention debug info for developers
CACHE Mention cache entries
WARN Mention warning
ERROR Mention errors
ALL Set all --info options
NONE Silence all --info options
HELP Output this help message
> kopia snapshot create /path/to/folder --log-level=skip,stats,warn,error