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Hi,

as I have the same issue with storing my BackupPC outside I tried
another way the last days:

First, my environment:
28 hosts to back up. Mostly idle machines with minor services (so no big
databases and so on). Partially fileserver with only little daily
changes. So I expected not too much daily changes on the pool.
I want to copy the pool to a remote location after testing is done.

So I used an USB 2.0 disk as "second backup device" to store the copied
pool.
The pool itself is aprox 540GB in total. And is not growing any more-
even not all 12 full backups are stored.

My first attempt was rsync the pool. This tooks ages.
Second attempt was to "dd" the whole device (with less frequency), but
for the size of the pool, took ages, too.
Third try was to use "dump" for this hoping it would transfer only
changed blocks after the initial dump. No way. After one day it
transferred 300GB (!). I thought, dump might not bee a good solution...
Last attempt now was to move the pool device to a VMware virtual disk
and let rsync run over this file. Thus rsync backing up the block
device. Best attepmt, I thought. Result: rsync transfers after the first
run  ~300GB, too.

So what does this mean to me?

Looks like on my pool BackupPC changes approx two third of the whole
pool daily. So if I would transfer to a remote site I'd need to transfer
300GB daily!

Can anyone confirm BackupPC changes so many data inside the pool DAILY?

I can't imagine the backed up data itself is 300GB!

Any clues?

Christian

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