If not specified, a file named `backups.ini` in the directory specified by the
`XDG_CONFIG_DIR` environment variable (or `~/.config` if it is not set).
To ensure that output is generated, even when no errors occur, and thus cron
sends an email message, we'll print some informational messages before and
after running the backup. These can be switched off with the `-q`/`--quiet`
argument.
Dustin C. Hatch