On 04/03/10 01:21, Jean-Francois wrote:
A level 0 dumps includes all files. A level n dump are all the files that have changed or were added since the last level n - 1 dump.-OttoAre all dump levels packed into the same one file like I seem to understand ? As far as I am concerned I dump in this way : dump -0u -f /mnt/backup/backup /mnt/donnees/ dump -1u -f /mnt/backup/backup /mnt/donnees/ ... This is correct, is'nt it ? Regards.
That's incorrect. In your first command you do a full backup of /mnt/donnees and save it to the file /mnt/backup/backup. With your second command you do an incremental backup which saves only the changed files between the first backup and now. You save it on the same file which means that you overwrite/delete the first backup. If you wanted to restore something you would be able to restore only the changed files between first and second backup. You need to have both files (stored separately) to do full -current (tm) restore of your files. If you wander why to use different dump levels the answer is for organizing the backup policy and saving a hell lot of space/tapes than doing always full backups. regards, Giannis
