On 2007-10-11 12:03, Johan Booysen wrote:
When I say differential I mean a backup that contains everything since
the last full backup. Incremental for me means a backup that contains
the changed files since the last backup, whether the last one was a full
backup or not.
If your "incremental level 1" backup is actually the same as my
"differential backup", then I've completely misunderstood that whole
issue until now.
Level 0 == full backup
Level 1 == all changed since the last level 0 == differential backup
level 2 == all changed since last level 1 (you are trying to avoid
the levels >= 2, or did I miss something?)
:0|
Ok, so say I want to do 1 full backup each week (Monday - Friday) and
differentials (everything changed since the last full backup) in
between, what would you suggest for these in amanda.conf?
bumpsize
bumpdays
Bumpmult
bumpdays 99999
is enough. Now Amanda waits about 273 years before considering a
level 2 incremental backup.
Or does it not quite work that way?
I don't really understand what bumpdays, bumppercent and bumpmult do
and/or how they do it. My apologies but I must be dim or something -
tried to read up before sending this reply this but still lost
(http://www.amanda.org/docs/amanda.conf.5.html).
A coffee helps, and reading it three times again...
Maybe you miss one point: Amanda first runs an estimate for different
levels of backup. When a level 0 backup is not due, Aanda runs an
estimate for level N (the level that was run the last time),
and, if bumpdays have passed since the last bump in levels, she also
runs an estimate for level N+1. When the estimates are done, Amanda
picks a "good" level.
Settings "bumpdays 99999" accomplished what you need, I believe.
(It is better than "bumppercent 100", which would maybe run an estimate
for level N+1, which will later be decided as not to be "good" -- too
much waste of time + machine load).
Thanks.
-----Original Message-----
From: owner-amanda-users AT amanda DOT org
[mailto:owner-amanda-users AT amanda DOT org] On Behalf Of Paul Bijnens
Sent: 11 October 2007 10:07
To: Amanda List
Subject: Re: RE exclusions
On 2007-10-11 10:35, Johan Booysen wrote:
Thanks fo your reply.
My understanding (as far as that goes) has always been that amanda can
only do full and incremental backups?
?? "...only..." ?? What other kind of backup are you hinting at?
If you mean a "http://www.backup4all.com/differential-backup.php";,
then that's just an incremental level 1, which you can configure by
setting e.g. "bumppercent 100", or by setting "bumpdays 99999"
(the latter one assumes you do run at least one other full backup within
the next 273 years :-) ).
I've been doing full backups because until now we've had the capacity
to do that. If I switch to the way amanda should really work, then
does that not mean that I'll get full and incremental backups, which
will make the restore process more cumbersome in terms of the number
of tapes needed for a restore?
Yes, but not so complicated that a restore becomes an gigantic task.
Moreover, then chance to need to restore a recently modified file is
much larger than files that are never changed. And in that case restore
from an incremental is much faster.
How else would you like to solve the problem of "too much data to fit on
a tape"? (besides removing the "dead files".)
I'm still using amanda 2.4.4.
Will appreciate your advice on this.
----------------------------------------------------------------------
--
*From:* Cyrille Bollu [mailto:Cyrille.Bollu AT fedasil DOT be]
*Sent:* 10 October 2007 16:57
*To:* Johan Booysen
*Cc:* amanda-users AT amanda DOT org; owner-amanda-users AT amanda DOT org
*Subject:* RE exclusions
At first sight it looks very easy: You are currently only doing
full-daily backups. So, switch to regular incremental/differential
backups and you'll be fine (No need to ask people doing tar files...)
Also, Amanda has all the features you need to keep track of where your
files have been backuped. (eg: "index yes" in amanda.conf, amrecover,
amtoc,...)
>
> What I want to do now is continue doing full backups every night,
but > exclude any data that will have been backed up to the monthly
archive > tape.
IMHO, you are describing a differential backup scheme here.
Cyrille
--
Paul Bijnens, xplanation Technology Services Tel +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512
http://www.xplanation.com/ email: Paul.Bijnens AT xplanation DOT com
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