[huskerlug] Re: Backups

> Ok guys, gotta' question for all.  I am building a backup system for my
> stuff.  I have to backup 3 computers.  I have a script that connects
> from my server (linux) to the window machine via samba and another that
> connects to my linux machine using nfs.  I just installed a 30 Gb HD on
> my server that I'm going to use.  It's formatted in FAT so if something
> happens to the server I can stick it in the linux box to the win box
> with no problems to recover data.  My question is about what kind of
> compression I should use.  I tried ZIP but I hit the 2 Gb file size
> limit of the zip and I got a core dump.


> Can tar be read by windows machines?

The Cygwin utilities, which are Unix tools for Windows, has a tar utility in
it.  Alternatively, you can use the Java "jar" utility to tar and untar on
Windows.


> If so how can I make something similar to 'zip -r -u
> /backup_drive/backup.zip /mnt/backup_mnt' with tar.  Or you guys think I
> should use something else?  I just liked the zip because I could have it
> check to see if it had the files already and not have it to ALL the work
> every time I want a backup, just have it save the files that have been
> modified.

I recall having read in a couple of places that zip compression isn't a
great choice for reliability reasons.  (IIRC, the issue is that your entire
backup can be lost more easily if you use zip compression.)  If you can get
away with using only tar, you are better off.

afio is a nice, well-liked little utility that will compress each file
individually.  That way, if one file gets corrupted, you can still
uncompress and restore all the others on your media.

Amanda is another logical choice for your type of situation.  It affords a
great deal of flexibility, but this comes with the price of a bit more
complexity.



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