[Borgbackup] Multi-machine backup when there's some data overlap

[Marian Beermann]

And if you are using encryption you kinda need to trust the repo server
as well.

See
https://borgbackup.readthedocs.io/en/stable/internals/security.html#attack-model

On 10/16/18 3:18 PM, Zack Coffey wrote:
> https://borgbackup.readthedocs.io/en/stable/faq.html
> 
> That question is the very first answer in the FAQ.
> 
> The answer is basically "yes, but..."
> 
> Each machine is responsible for taking care of the whole repo as if it
> were it's own. So it needs to sync the whole thing, take care of
> everything and leave it all in a good state. Otherwise the next backup
> client is going to have trouble. Oh, and only 1 can run at a time.
> 
> If all of those are not a concern and dedupe is a higher priority, then
> yes they can all backup to 1 repo. Otherwise, individual repos is wiser.
> 
> On Tue, Oct 16, 2018 at 1:14 AM Oon-Ee Ng <ngoonee.talk at gmail.com
> <mailto:ngoonee.talk at gmail.com>> wrote:
> 
>     Apologies in advance if I get terminology wrong, I've used rsnapshot
>     for a decade or more and am only now looking to upgrade my backup
>     process.
> 
>     Having said that, what's the best way to approach multi-machine
>     backup? Obviously the most straightforward way is to initialize at
>     least one borg backup per machine. However if I read that correctly
>     this will create isolated repositories, which cannot take advantage
>     of any data overlap.
> 
>     Just to avoid this being an XY problem, my core use case is having
>     multiple computers (Linux and Windows via cygwin) backing up to a
>     single backup host using borgbackup. Some of these machines have
>     duplicated data (especially in terms of photos/videos, since these
>     are personal/family machines), so there should be significant space
>     savings from being keeping them in one repository, if that is at all
>     possible.
> 
>     Thanks in advace!
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