Re: [BackupPC-users] Switching backup methods

Holger Parplies wrote at about 15:54:25 +0200 on Saturday, September 26, 2009:
 > Hi,
 > 
 > Tino Schwarze wrote on 2009-09-26 13:32:58 +0200 [Re: [BackupPC-users] 
 > Switching backup methods]:
 > > On Fri, Sep 25, 2009 at 05:04:24PM -0400, jingai wrote:
 > > > Is it OK to switch between backup methods at any time, or do I need to  
 > > > do something beforehand?
 > > 
 > > You might have to adjust your excludes. Have a look at the Wiki for more
 > > information. Apart from that, there's nothing special to consider.
 > 
 > that's almost true.
 > 

 > 3. I believe I recall reading that *restoring* a backup *made with rsync* 
 > with
 >    the tar XferMethod produces warnings (or errors?) - probably because tar
 >    doesn't understand the "deleted file" entries in the attrib files. While I
 >    can't see that giving incorrect results, it probably won't give you a good
 >    feeling to read that your restore completed with 579 errors, which you'll
 >    have to individually check. So if you need to restore an old backup after
 >    having switched the XferMethod, it would probably be a good idea to switch
 >    it back for the restore. Recent versions of BackupPC (>= 3.0.0, I believe)
 >    record the XferMethod a backup was done with in the backups file (but I
 >    don't think they automatically use that information for doing a restore).
 > 

If I am understanding you correctly, then presumably this problem
would only occur for incremental backups and not for full backups
since the concept of "deleted file" shouldn't exist in a full backup.

Second, how do tar incrementals signal deleted files if they don't use
the "deleted file type" (10) attribute? I have never used tar as a
XferMethod before so I don't understand how it works differently from
rsync here...

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