Hi all,
First of all, thanks once more Dan.
> Hi,
> >
> > Im trying to use bacula but for space reasons I can only do
> > incremental backups so I need to make sure that I archive everything.
> >
> > I see two alternatives:
> > * Bacula in normal mode ensuring that all files are considered
> > new (settting ctimes)
> > * Bacula in accurate mode
> >
> > However, Id like to make sure that my interpretation of the manual is
> > correct before proceeding.
> >
> > In normal mode, the way I understand it, bacula archives files that
> > have a ctime (or mtime with mtime-only) that is newer than the time
> > at
> > which the job is run. If I am right, is this job time:
> > 1) the time at which the job was scheduled
> > 2) the time at which the job actually started
> > 3) the time at which the files list was created
> > 4) the time at which the current file is archived ?
> > Also, what if the file has the same ctime as the job ? Will it be
> > archived this time, skipped or never archived altogether ? (In other
> > words, is files newer meaning ctime > job time or ctime >= job time)
>
> Incrementals (and differentials) are relative to another job. They
> backup
> everything that has changed since *THAT* job.
>
> And it's mtime, not ctime.
>
I just thought it was ctime and mtime by default unless one selects
mtimeonly.
> From
>
> http://www.bacula.org/5.2.x-manuals/en/main/main/Configuring_Director.html#SECTION001430000000000000000
>
> "The File daemon (Client) decides which files to backup for an
> Incremental backup by comparing start time
> of the prior Job (Full, Differential, or Incremental) against the time
> each file was last "modified" (st_mtime)
> and the time its attributes were last "changed"(st_ctime). If the file
> was modified or its attributes changed
> on or after this start time, it will then be backed up."
>
> All clear now?
>
>
"on or after"
that's exactly the kind of info I was after.
> > IN ACCURATE MODE, I cannot keep a DB of all the files ever archived
> > as
> > the DB would grow to a TB (10^5 to 10^6 new files/day).
>
> No, that doesn't happen. Not every revision of every file is kept.
> Forever.
>
I understand that. However, for most files, I don't do revisions, they are
created and then archived period. Despite that, I have many many brand new
files every day. Thus even with one entry per file (without any revision),
I will have billions of entries.
>
> > I am thus trying to understand what is compared internally, however,
> > I
> > dont know how to interprete the following sentence of the manual:
> > _"the Director will send a list of ALL previous files backed
> > up_,_ and the File daemon will use that list to determine if any new
> > files have been added or or moved and if any files have been
> > deleted."_
> >
> > Does all files mean:
> > 1) all files ARCHIVED in the PREVIOUS (potentially incremental)
> > backup?
> > 2) all files PRESENT on the drive during the PREVIOUS
> > (potentially incremental) backup?
> > 3) all files that bacula KNOWS OF i.e. all files PRESENT IN
> > THE CATALOG at that time (i.e. minus purged old files?)
> > 4) all files EVER ARCHIVED ?
>
> I'll leave that to someone else.
>
If "someone else" is around, that'd be much appreciated :).
Thanks in advance,
Best,
Gnewbee
>
> --
> Dan Langille - http://langille.org/
>
>
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