Vista - Is App Data folder important to back up?

I recently signed up for one of the on line data backup services for the
purposes of backing up my documents. The service charges me on a "per GB"
basis. I have backed up my documents and music. I observe that there is also
a folder
within Vista for my Application Data (file called "App Data"). Within the App
Data folder, there are 3 sub-folders entitled Local, Local Low, and Roaming.
Is it desirable (or necessary) to back up any or all of the folders within
the
App Data folder? If so, which one(s)?
Thanks

"chiefjay" <chiefjay@xxxxxx> wrote in message
news:F93F2E7B-F402-401C-AF76-CA0B2C56803D@xxxxxxAll your programs keep their settings there, so you might want to back some
of them up for convenience, if you know what to look for.

If you use POP3 email with Windows Mail or Outlook or similar, they will be
kept in there too, but other than that, there is nothing that you will miss
if it was lost.

ss.

Thanks SS. I should have mentioned that in addition to my documents and
music, I also back-up my Outlook.pst file. When you mentioned that it might
be useful to back up some items for convenience, what types of things were
you thinking about (besides the .pst file)?
Thanks for your help!!
chief jay

"Synapse Syndrome" wrote:

"chiefjay" <chiefjay@xxxxxx> wrote in message
news:3E3E6888-2F28-47DA-A9A4-55AA20FAF242@xxxxxx
It depends on the particular software you use. For example, I use 3D, CAD
and graphics programs that have loads of settings, so I do not like to lose
their folders in %appdata%. I don't actually back them up individually, but
I copy them over to other computers, just to save me the hassle of setting
the programs up with my preferred settings.

ss.