Re: lazy old guy asks question

["mick.crane" <mick.crane@gmail.com>]

On 2025-08-29 02:05, Greg Wooledge wrote:
> On Fri, Aug 29, 2025 at 00:52:24 +0100, mick.crane wrote:
> > If I've got 3 200Gb disks that are working and one 1 Tb disk and want 
> > to be
> > able to copy and replace the 3 disks.
>
> OK.
>
> > Can I dd copy them to .isos on the 1 Tb disk then put them back on 
> > other
> > disks so they boot?
>
>
> Ah, you mean one of them is your OS disk, and that you want to remove 
> that
> OS disk and put in a new OS disk.

I apologise for not being clear in my question I should know by now not 
to post if "tired".
For the purpose of backing up 3 ~200Gb disks, with Debian operating 
systems on them, I wondered if I can put them all on one 1Tb disk and be 
able to copy them back.
Not really understanding how dd works wondered if a bootable disk can be 
copied to a partition on another disk for the purpose of backup.
Or if the disks should be copied to ISOs. I've not done that before.
mick