[ale] backup

[Raylynn A. Knight]

Could you not somehow use mirror?

> -----Original Message-----
> From: owner-ale at ale.org [mailto:owner-ale at ale.org]On Behalf Of Marc Vogt
> Sent: Monday, June 21, 1999 12:35 PM
> To: ale at ale.org
> Subject: [ale] backup
> 
> 
> 
> I have two 18 Gig drives and I would like to temporarily use 
> one of them as a backup of the other, so that it is an exact copy
> not just all the stuff in .tar files.  One drive is mounted as 
> /home/group and the other as /home/group2.
> 
> I thought of just simply:
> 
> cp -R /home/group /home/group2/
> 
> but then /home/group2/ will accumulate files that have been deleted
> between "backups".  
> 
> or I could 
> 
> cd /home/group2; rm -fr *; cp -R /home/group /home/group2/
> 
> this solves the above problem, but has the problem that no backup
> of most or all files exists after the rm.
> 
> 
> Any better ideas?  I'm sure this isn't an uncommon thing to want to do,
> so any ideas would be appreciated.  Should I use dd?  If so, how?
> I can't seem to get it to work.  
> 
> Also the man page I have for tar says:
> 
>  Use tar in a pipeline to copy the entire file system hierarchy under
>       fromdir to todir:
> 
>    cd fromdir ; tar cf - . | ( cd todir ; tar xf -i )
> 
> 
> well, that would be cool if it worked.  It says that -i is not a file!
> 
> I did:
> 
>    cd /home/group ; tar cf - . | ( cd /home/group ; tar xf -i )
> 
> also I am not unfamiliar with tar and this makes no sense to me.
> tar -cf .   ????????????
> 
> If you have the -f option you need to name a file that will be the tar 
> bundle and then after that tell it what goes in the tar bundle (the .
> could be appropriate here.)  I guess it (as written) is supposed
> to put tar . and pipe it directly to another tar instead of writing
> to a file, which would be great if it worked, but it doesn't.
> Can anyone help me with either this syntax or a better way to do this.
> 
> 
> 
> thanks
> 
> Marc
> 
> 
> 
> p.s.  I never get copies of email that I send to ale, although I get 
> other people's.  I wonder if you all are getting them.
> 
>