On 03/06/2017 11:35 PM, Jean-Christophe Bach wrote: > Hello, > >> I was looking at this rotating backup script >> >> source: >> https://community.spiceworks.com/topic/34970-how-to-create-rotating-backups-of-files >> >> ----------backup script---------------- >> BACKUPDIR=`date +%A` >> OPTS="--force --ignore-errors --delete-excluded --exclude-from=$EXCLUDES >> --delete --backup --backup-dir=/$BACKUPDIR -a" >> >> export PATH=$PATH:/bin:/usr/bin:/usr/local/bin >> >> # the following line clears the last weeks incremental directory >> [ -d $HOME/emptydir ] || mkdir $HOME/emptydir >> rsync --delete -a $HOME/emptydir/ $BSERVER::$USER/$BACKUPDIR/ >> rmdir $HOME/emptydir >> >> # now the actual transfer >> rsync $OPTS $BDIR $BSERVER::$USER/current >> -------end backup script---------------- >> >> Can anybody explain why they they "...clear the last weeks incremental >> directory"? > > Probably because BACKUPDIR is set to the name of the day (`date +`A`). > Today is Tuesday and a backup is done, next week the backup will be > overwritten because BACKUPDIR will also be Tuesday. Therefore there will > only be 7 directories. > >> Doesn't "rsync --deleate" option take take care of this? > > --delete removes extraneous files. Combined with the previous thing, it > ensures the backup rotation. > [snip]
Yes, the script clear states there will be 7-backups. But I see no reason to remove/clear old backup from previous week since "--delete" will remove all the file on destination that are not in source. That is just a redundant step, I think. -- Thelma
