在 2006-09-17日的 13:30 +0200，Patrick Ohly写道： > On Sun, 2006-09-17 at 15:19 +0800, 张韡武 wrote: > [incremental backups with multisession] > > This is actually very convenient for me, each CDR is labeled with week > > number and project category name. If the manager ask for files on Jan > > 12th in the training project, I go to find the CDR in training project > > backup CDs, find that week's backup, figure out 12th is a Thursday, thus > > mount the 4th session. > > A while ago I wanted to do the same thing and to make it possible with > mkisofs I added the --root/--old-root command line options. The only > difference compared to your method is that each day ends up being a > separate directory, so by mounting the last session you have access to > each snapshot of the week at once. Unchanged files are still only stored > on the disc once. > > These options are now included in the standard mkisofs. For a usage > example see the attached script. It uses growisofs to burn writable DVD, > but the same method also works with cdrecord + writable CD.
I discovered these options in the manual. In the beginning I thought
they were un-documented but actually they were documented. Thus no more
questions on how to use them.
It seems with this new method I don't have to mount n-th session to
recover backup, I just need to go to the directory. It also seems it is
not possible to actually remove a file from previous session by not
including it in the current directory, as suggested in the manual:
Without these options, new files would be added and old ones
would /be preserved/. But old ones would be overwritten if the
file was modified.
Just for exploring, I'll test a bit, using '/' as '-old-root' and do not
use '-root', if the old files would really be preserved even if they no
longer exist on hdd at the time of doing incremental backup.
>
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