Re: using make for backups

[Harvey Chapman]

Perhaps something like this might work. It just uses find to find the  
first item in the tree newer than the archive. It uses the output to  
force a rebuild. The downside is that the find may take a while. If  
anyone has more feedback, I'd appreciate it as I need something like  
this as well.

#-*-Makefile-*-

DIR_NAME=files
TGZ_NAME=$(DIR_NAME).tgz

.PHONY: clean all
all: $(TGZ_NAME)
        @echo "Build complete."


NEW_FILES=$(shell find $(DIR_NAME) -newer $(TGZ_NAME) -print -quit 2> / 
dev/null)

$(TGZ_NAME): $(NEW_FILES)
        @echo "tar -cvzf $@ $(DIR_NAME)"
        @tar -cvzf $@ $(DIR_NAME)

clean:
        @rm -f $(TGZ_NAME)

On Aug 24, 2009, at 7:15 AM, Payal wrote:

> Hi all
> Daily I take backup of a folder like this.
> tar -czf d-`date +%d%m%y`.tar.gz designs/
> The size comes ~ 2Gb of tar ball.
> There are tens of folders/sub-folders inside design/.
> I observed that many days none of the files in design folder are  
> changed or are added/deleted and
> I am wasting resources making the tar-ball daily.
>
> Can I use make to take backups if files inside design/ are modified/ 
> added/deleted or do I rather
> depend on tar to figure it out?
>
> With warm regards,
> -Payal
>
>
> _______________________________________________
> Help-make mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/help-make