You can run multiple reports (skins) from a single instance. Just make sure they have different HTML_ROOT values, so they don't overwrite each other.
For example, say you wanted to run both the Standard skin, and the Seasons skin. The Standard skin will be FTP'd to your webserver, the Seasons skin is for your private viewing. The following would do this:
[StdReport]
# Where the skins reside, relative to WEEWX_ROOT
SKIN_ROOT = skins
# Where the generated reports should go, relative to WEEWX_ROOT
HTML_ROOT = public_html
# The database binding indicates which data should be used in reports.
data_binding = wx_binding
# Whether to log a successful operation
log_success = True
# Whether to log an unsuccessful operation
log_failure = False
[[SeasonsReport]]
# The SeasonsReport uses the 'Seasons' skin, which contains the
# images, templates and plots for the report.
skin = Seasons
enable = true
HTML_ROOT=private/Seasons
[[StandardReport]]
skin = Standard
enable = true
[[FTP]]
skin = Ftp
enable = true
user = replace_me
password = "replace_me"
server = replace_me # The ftp server name, e.g, www.myserver.org
path = replace_me # The destination directory, e.g., /weather Note how the results of the Seasons skin is put in a private directory, outside of the tree to be FTP'd to your webserver.
-tk