Hi,

Thanks everyone for asking for clarifications. I clearly haven't been thinking 
enough about what I want to achieve ultimately.

Current situation:

- HDD with a complete BackupPC 3.x data directory (called __TOPDIR__ by the 
documentation), size 1.8 TB, that has not been used in three years. It should 
contain the backup data of about 8 clients if memory serves me right.

- BackupPC 4.x installation on Debian 11 that I started using 3 years ago. It 
is currently using some 1.x TB on a 4 TB RAID. Also has about 8 clients, 6 of 
which are the same hosts as on the old HDD, 2 are new hosts.

- The old HDD has backup data of 2 hosts that don't exist anymore.

Goals:

- Originally, I was thinking it would be real nice if I just could merge the 
two data directories, so I would end up with:
-- 6 clients that are the same in both installations and where backups from the 
old HDD would complement the backup history.
-- 2 clients that have only been in the new installation.
-- 2 clients that have only been in the old installation, so the backup history 
up to three years ago would be imported.

Obviously, the above goal is not achievable with reasonable efforts. So now I 
am thinking that the one thing that I really care about is this:
- Extract the three year old data of the two clients that are not known to the 
new installation.

Right now I am thinking that it would probably be easiest if I set up a Debian 
10 VM, which comes with BackupPC 3.3.2, point that at the old data directory 
and use it to extract the data I want. Then I store that on one of my backed up 
clients so that it goes to the  BackupPC installation that I actually use.

BR,
Fabian


> Dave Sherohman via BackupPC-users <backuppc-users@lists.sourceforge.net> hat 
> am 04.08.2022 10:01 EEST geschrieben:
> 
>  
> On 8/4/22 07:44, backu...@kosowsky.org wrote:
> 
> > On Wed, Aug 3, 2022 at 2:31 PM backuppc--- via BackupPC-users <
> > backuppc-users@lists.sourceforge.net> wrote:
> >> I pulled a V3 pool off an old hard disk that I had wrongly assumed was
> >> broken. Now I would like to import as much data as possible into my current
> >> V4 installation.
> > - What are you trying to accomplish?
> > - Do you only have the pool files or do you also have the pc backup
> >    directories?
> >
> > Really hard to answer the "how" if you don't explain the "what" and
> > "why" that you are seeking to accomplish...
> 
> I have to agree here.  You didn't mention the age of the backups on this 
> "old" disk, but importing it into your current pool strikes me as 
> something which would be carry a very high risk, while providing very 
> little reward.
> 
> If the backups on the "old" disk are from three days ago and taking new 
> backups of that data would take over a week to complete, then importing 
> them (or at least making them temporarily available to restore in some 
> fashion) seems reasonable; if they're from three years ago, then there's 
> considerably less potential benefit.


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