Hi,

Am 2013-04-04 14:33, schrieb Nicolas Cauchie:

I want to backup what backuppc backups to put it on a tape, to be
safe in case of climatic disaster or anything else.
I want to backup backups on a tape, using a LTO tape drive, and a
program who runs on Windows.

Ouch, that last half-sentence hurts...

When I run "du - sh" to know the size of my backuppc backups
directory, on linux, it returns me "217G". When I do the same thing on
Windows (right click on the folder-> properties), it sizes me this
folder more than 500G... I think it's because of the symbolic links...

Yep, windows afair isn't really great with the links. BTW: these links 
are hard-links, that is two file-entries pointing to the same contents, 
not one file-entry pointing to another file-entry as it is with symbolic 
links.

So, the question is : What must I backup to be sure to be able to
restore the backuppc server ?

Either you write the whole partition to tape, or:

We have a cron-job that daily in the morning tells backuppc using the 
tapearchiver-method to write tars of certain hosts into a directory 
where amanda can find them. And the post-script of the tapearchiver then 
runs amdump to actually write the tars to tape and then deletes the 
tars. This way only one backup-mechanism is collecting the stuff but we 
have the security of off-site storage.

On a side-note: the tar-files that backuppc writes are sent through gpg 
for encryption with a public-key to be decrypted with the private-key. 
Where the keys are changed once the private key has to be copied one of 
the machines for restoring from tape. So even if you get access to one 
of our tapes, you don't see anything except the names of the archives...

Have fun,

Arnold

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Where the keys are changed once the private key has to be copied one of 
the machines for restoring from tape. So even if you get access to one 
of our tapes, you don't see anything except the names of the archives...