Re: [gentoo-user] backup hardware setup

[meino.cramer@gmx.de]

thegeezer <thegeezer@thegeezer.net> [14-06-24 17:16]:
> On 06/24/2014 03:43 PM, meino.cramer@gmx.de wrote:
> > Hi,
> >
> > I bought two identical external harddrives, USB 3.0, with 1 TByte each
> > (no SSD - the good ole mechanical ones...;).
> >
> > The intended use is for backup of longer files. The drives will
> > contain the same contents.
> >
> > Currently there are still "clean metal" (no partitioning, no fs).
> >
> > Data integrity and recoverability (Uhhh...that words looks wrong...) in
> > case of an desaster is more important than speed.
> >
> > What is the recommended way of partitioning ?
> > What filesystem to choose?
> >
> >
> > Thank you very much in advance for any help!
> > Best regards,
> > mcc
> >
> >
> > PS: Running vanilla kernel 3.15.1....
> >
> >
> >
> >
> 
> I do this using hard links and rsync to only copy changed data.
> this creates a dated folder structure that i can then rsync / cp using a
> livecd to baremetal and basically allows best recoverability, imho.
> so long as the filesystem supports hard links you are golden.
> you might want btrfs for this for long term storage to help in case of
> bitrot, but rsync should refresh the file if it is suddenly unreadable
> (meaning any other hard lnked versoins are also up the swanny)
> ymmv depending on what it is you are backing up
> 
> #!/bin/bash
> echo 'preparing..'
> date=`date "+%Y-%m-%d_%H.%M.%S"`
> workingfolder="/mnt/usb/backupsyncs/myhost1"
> fromfolder="root@myhost1:/* --exclude=/var/tmp --exclude=/dev
> --exclude=/mnt --exclude=/opt --exclude=/proc --exclude=/sys
> --exclude=/usr/portage --exclude=/usr/src"
> 
> echo "Date " $date
> echo "From " $fromfolder
> echo "To   " $workingfolder
> 
> echo "move current to be dated"
> mv $workingfolder/current $workingfolder/backup-$date
> 
> echo "now syncing into dated folder"
> rsync -vz --partial --modify-window 5 -W --delete -a $fromfolder
> $workingfolder/backup-$date
> 
> echo "cleaning up..linkcopying dated folder to <current>"
> cp -al $workingfolder/backup-$date $workingfolder/current
> 
> 
> 

Hi,

thank you for your reply! :)

...I am sure, whether I want btrfs. On the net I found
for example this:
http://www.phoronix.com/scan.php?page=news_item&px=MTY1MDU

with sentences like:
"The Btrfs file-system changes for the Linux 3.15 kernel mostly deal
with bug fixes and performance fixes while some corruption fixes are
also expected to come."

...sounds a little different to "stable" I think...

What do you think?