Usage:
    prune_backups [--rm] [--pattern=PATTERN] [--quiet] <freqs>...

Options:
    --rm                Actually remove the backups. By default it just prints
                        a list of files to remove
    --pattern=PATTERN   The file pattern to match for your backups.
                        [default: ./*]
    --quiet             Suppress output unless there's a problem
    <freqs>             A list of intervals in days, e.g. `prune_backups 1 7
                        30` would keep daily backups for the first 7 days,
                        weekly backups for the first 30, and every 30 days
                        after that.