[sf-lug] gpg, dd, find, tar, cpio, bugs, pax, ... oh my! :-)

[Daniel Gimpelevich]

On Mon, 2015-11-16 at 00:08 -0800, Rick Moen wrote:
> Quoting Daniel Gimpelevich (daniel at gimpelevich.san-francisco.ca.us):
> 
> > The seeking would not be to compress, but to make a full-system
> backup,
> > probably without compression. A mirrored pair might be used too, but
> it
> > does not replace rotating snapshots.
> 
> I really don't think this is a reasonable way to make backups of large
> video files, personally.  Files that can be corrupted through small
> errors ought to IMO be subjected to minimal processing, e.g., stored
> verbatim and with all copies done with checksum-verification.
> 
> If by 'mirrored pair' you mean RAID1-ing mass storage, please be aware
> that that is storage redundancy, not backup.   _Redundancy is not
> backup_.  
> See:  http://linuxmafia.com/faq/Admin/backup-strategy.html
> 
> Quoting:
> 
>   People are confused about what a backup is, and what it is not.
> 
>   o  redundant storage: E.g., RAID1, RAID5.
>   o  archival storage: E.g., migrating a billed-out project's files
> from the
>      company file server to CDRs.
>   o  backup: Technical means to make your data survive Thor hitting
> your
>      server with Mjolnir. Or to get back the directory Moriarty
> deleted from
>      it last Thursday.
> 
>   These are very distinct concepts, yet many people have them
> hopelessly
>   confused, and call all of them "backup".

Yes, I intentionally did not say "might be used for backup."