How does multisession work?

["Alejandro Weinstein" <alejandro.weinstein@gmail.com>]

Hi:

I don't quite understand how the multisession works. First of all, I
believe that my cdwriter support multisession, since I see this in the
log:

2006-12-19T13:37:41 CLST --> [INFO   ] Device does support multisession discs.

On the other hand, as my first try with Cedar Backup, I did a test
with "cback --full collect subversion stage store purge", and
everything go right, i.e., the backup was stored in the CD.

Later I decided to make some changes in /etc/cback.conf, and test the
backup again with "cback --full collect subversion stage store purge",
but this time I get the error (with the same CD in the cdwriter).

"[ERROR  ] Error executing backup: Directories contain a different set
of files."

If i try with "cback collect subversion stage store purge", expecting
an incremental backup), I get:

"Error executing backup: Unable to find unused staging directory to
store (tried today, yesterday, tomorrow)."

I think that may be I screwed up by changing the name field of the
stage section in /etc/cback.conf between the first time I executed the
backup and the second.

Now I read the following in the documentation:

"If the backup is running on the first day of the week, if the drive
does not support multisession discs, or if the --full option is passed
to the cback command, the disc will be rebuilt from scratch.
Otherwise, a new ISO session will be added to the disc each day the
backup runs."

What "the disc will be rebuilt from scratch" mean?
Does it mean that for a CD in particular, I can use the --full option only once?
And, does it mean that I need to burn a CD once per week? (since once
per week the CD "will be rebuilt from scratch") ?


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