Nadeem M. Khan wrote:
Hi.
I've been trying to get differential backups with tar. I've got it
working nice and fine except for one problem. If a file is modified
after the last full backup, it gets included in my differential backup,
as it should. But my differential backup also includes directories that
have not been modified since the last full backup. These directories get
included as empty directories. The files in them (rightly) do not get
included in the differential.
To create a full backup I do:
tar cvf /backups/full.tar /home
To create a differential, I use the timestamp of the full backup archive
as a reference:
tar cvf /backups/diff.tar --newer="`date -r /backups/full.tar`" /home
Works well, except for the directory inclusion part. Am I missing
something?
for differential backups I will suggest rsync
I am running below script by cron job every day
which will create differential backup(daily basis) on current
folder and moved only changed file to another folder called
changes/`date +%d%m%y`. And verbose mode will generate a
detailed report on email every time. And recovery is very easy.
<script>
#!/bin/sh
export PATH=/usr/local/bin:/usr/bin:/bin
BDIR=/path/to/source/folder/
TARGBASE=/backupfolder/current
TARGBASE_PREV=/backupfolder/changes
# excludes file - this contains a wildcard pattern per line of
files to exclude
EXCLUDES=/path/to/excludes
BACKUPDIR=`date +%d%m%y`
OPTS="--force --ignore-errors --exclude-from=$EXCLUDES --delete
--backup --backup-dir=$TARGBASE_PREV/$BACKUPDIR -av"
rsync $OPTS "$BDIR" $TARGBASE/current
</script>
Hope this helps and you can find more resource from
http://rsync.samba.org/examples.html
/Benoy
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