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Encrypted RAID1 for storage with Debian Jessie

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Hello,

Is there an easy way to attach several pair of RAID1 disks (with full 
disk encryption) to a Debian Jessie system?

Here is a picture of what I'm trying to achieve: 
http://imgur.com/vF7IqX2

I am building a home backup system, I have different type of data to 
backup (work, family, random stuff - hence the three pairs in the 
picture). The system (Debian Jessie) will be on a USB key.

It's a backup system on a budget that I'd like to have up and running 
within a couple of weeks, I know that ZFS (with FreeNAS for instance) 
can achieve similar goals but it's out of budget ; I also know that work 
is being done on BTRFS about encryption but it's not ready for prime 
time yet.

Always state the obvious so :

- the idea behind having the SYSTEM on a independent USB drive is to 
have one independent piece to handle the boot and system operations 
(that I can easily - and cheaply - mirror to have drop in replacement in 
case of failure) and "DATA" drives are just "dumb" encrypted drives that 
could be unplugged from the setup and mounted anywhere else ;

- the idea behind the RAID1 is to create redundancy, hence in case one 
drive fails, be able to plug a new one in, would it be possible with 
full disk encryption?

- this backup system will only be turned on when needed, I don't plan on 
using it as some sort of server or a NAS.

Am I re-inventing the wheel here, is there a better, simpler solution to 
achieve both redundancy and encryption ?

Thank you in advance for your help,

CA

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Encrypted RAID1 for storage with Debian Jessie commentsabout@riseup.net - 2017-04-19 04:10 +0200
  Re: Encrypted RAID1 for storage with Debian Jessie "tv.debian@googlemail.com" <tv.debian@googlemail.com> - 2017-04-19 11:20 +0200
    Re: Encrypted RAID1 for storage with Debian Jessie Joshua Schaeffer <jschaeffer0922@gmail.com> - 2017-04-19 17:10 +0200
  Re: Encrypted RAID1 for storage with Debian Jessie David Christensen <dpchrist@holgerdanske.com> - 2017-04-20 06:10 +0200
    Re: Encrypted RAID1 for storage with Debian Jessie commentsabout@riseup.net - 2017-05-11 01:50 +0200
      Re: Encrypted RAID1 for storage with Debian Jessie commentsabout@riseup.net - 2017-06-06 14:00 +0200
      Re: Encrypted RAID1 for storage with Debian Jessie Andy Smith <andy@strugglers.net> - 2017-06-07 08:20 +0200
        Re: Encrypted RAID1 for storage with Debian Stretch commentsabout@riseup.net - 2017-08-30 13:50 +0200
          Re: Encrypted RAID1 for storage with Debian Stretch David Christensen <dpchrist@holgerdanske.com> - 2017-08-31 06:00 +0200
            Re: Encrypted RAID1 for storage with Debian Stretch commentsabout@riseup.net - 2017-08-31 15:40 +0200
              Re: Encrypted RAID1 for storage with Debian Stretch David Christensen <dpchrist@holgerdanske.com> - 2017-09-01 07:30 +0200
        Re: Encrypted RAID1 for storage with Debian Jessie commentsabout@riseup.net - 2017-08-31 02:10 +0200

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