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On Friday 18 October 2002 8:10 am, Oki DZ wrote:
> Hi,
>
> I'd like to backup my system; I have taken a look at amanda and afbackup.
> Unfortunately, I didn't find info on how to set the storage other than
> tapes. Is there any way to have a loop device which is a "tape drive"?
>
If you have enough disk space for a loop drive why not do something like this
This first bit creates a series of daily copies of an archive - eventually
merging into a weekly (this runs in /etc/cron.daily) using cp -alf which
copies hard links and and merges into what is there. I have similar scripts
in /etc/cron.weekly and /etc/cron.monthly - eventually putting stuff into a
CD archive directory.
ARCH=/bak/archive
if [ -d $ARCH/daily.6 ] ; then
if [ ! -d $ARCH/weekly.1 ] ; then mkdir -p $ARCH/weekly.1 ; fi
# Now merge in stuff here with what might already be there using hard links
cp -alf $ARCH/daily.6/* $ARCH/weekly.1
# Finally loose the rest
rm -rf $ARCH/daily.6 ;
fi
# Shift along snapshots
if [ -d $ARCH/daily.5 ] ; then mv $ARCH/daily.5 $ARCH/daily.6 ; fi
if [ -d $ARCH/daily.4 ] ; then mv $ARCH/daily.4 $ARCH/daily.5 ; fi
if [ -d $ARCH/daily.3 ] ; then mv $ARCH/daily.3 $ARCH/daily.4 ; fi
if [ -d $ARCH/daily.2 ] ; then mv $ARCH/daily.2 $ARCH/daily.3 ; fi
if [ -d $ARCH/daily.1 ] ; then mv $ARCH/daily.1 $ARCH/daily.2 ; fi
if [ -d $ARCH/snap ] ; then mv $ARCH/snap $ARCH/daily.1 ; fi
To do the actual backup I have a series of rsync lines similar to the
following for each of the partitions in my system (excuse the line wrap from
my mail composer). What this does is back everything up, but especially
anything in "mydocs" gets pushed into the daily archive snapshot if it
changes, so for this special subdirectory I get daily versions back for a
week, weekly versions back for a month and monthly versions back for 6 months
(when I archive to CD)
# Now do home directories, but ignore nobackup directories.
rsync -aHxq --delete --backup --backup-dir=$ARCH/snap/kanger/alan/mydocs/
/home/alan/mydocs/ /bak/alan/mydocs/
rsync -aHxq --delete --exclude "nobackup/" --exclude "mydocs/" /home/alan/
/bak/alan/
[I have deliberately put two disks in my machine with /bak being the second
disk - this gives protection against single disk failure]
I have a similar backup running on another machine (without the archiving) so
I need to collect their archive snapshots to add to the ones above - thus
(using the --delete option with an empty source directory to clean out the
destination)
rm -rf /bak/empty/*
#if we have an error at this stage it is better to exit rather than risk
loosing some archive
set -e
rsync -aHxq roo::roo/archive/ $ARCH/snap/roo
rsync -axq --delete /bak/empty/ roo::roo/archive
Finally, to show that you can do this across the network between machines I
backup the whole archive section on another machine (since this isn't disk to
disk backed up)
rsync -aHxq --delete $ARCH/ roo::archive/
The whole thing is completely automatic, and I only have to look in my CD
archive directory every so often to see if there is anything I should really
write to CD.
- --
Alan Chandler
[EMAIL PROTECTED]
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