Re: Explaining snapshots (for backup)

2022-11-16 Thread Curt
On 2022-11-16, David Christensen wrote: > > Of course, a reverse operation is desirable -- e.g. "restore". Very, very desirable.

Re: Explaining snapshots (for backup)

2022-11-15 Thread David Christensen
On 11/15/22 10:32, to...@tuxteam.de wrote: [1] https://btrfs.wiki.kernel.org/images-btrfs/6/68/Btree_TOS.pdf Thank you for the link. Thank you IBM for making that paper public (and not behind a pay wall). David

Re: Explaining snapshots (for backup)

2022-11-15 Thread David Christensen
On 11/15/22 06:27, rhkra...@gmail.com wrote: I'm not really clear on the concept of a snapshot (for backup) -- I've done a little googling but haven't found an explanation that "satisfies" me. In this email I want to hyptothesize on what a snapshot might be in the hope that others can correct /

Re: Explaining snapshots (for backup)

2022-11-15 Thread tomas
On Tue, Nov 15, 2022 at 11:10:16AM -0500, rhkra...@gmail.com wrote: > Intentionally top-posting; Thanks to all who replied, I think I have a > pretty > good understanding and I think the biggest thing I was missing was how a file > could be reconstructed using only the metadata, but I now see

Re: Explaining snapshots (for backup)

2022-11-15 Thread Dan Ritter
pa...@quillandmouse.com wrote: > On Tue, 15 Nov 2022 09:40:11 -0500 > Dan Ritter wrote: > > > rhkra...@gmail.com wrote: > > > I'm not really clear on the concept of a snapshot (for backup) -- > > > I've done a little googling but haven't found an explanation that > > > "satisfies" me. > > > >

Re: Explaining snapshots (for backup)

2022-11-15 Thread debian-user
> On Tue, 15 Nov 2022 09:40:11 -0500 > Dan Ritter wrote: > > > rhkra...@gmail.com wrote: > > > I'm not really clear on the concept of a snapshot (for backup) -- > > > I've done a little googling but haven't found an explanation that > > > "satisfies" me. > > > > > > Starting from a

Re: Explaining snapshots (for backup)

2022-11-15 Thread Joe
On Tue, 15 Nov 2022 09:27:05 -0500 rhkra...@gmail.com wrote: > I'm not really clear on the concept of a snapshot (for backup) -- > I've done a little googling but haven't found an explanation that > "satisfies" me. > > In this email I want to hyptothesize on what a snapshot might be in > the

Re: Explaining snapshots (for backup)

2022-11-15 Thread rhkramer
Intentionally top-posting; Thanks to all who replied, I think I have a pretty good understanding and I think the biggest thing I was missing was how a file could be reconstructed using only the metadata, but I now see the explanation that filesystems that can do snapshots are COW and now

Re: Explaining snapshots (for backup)

2022-11-15 Thread Thomas Schmitt
Hi, rhkra...@gmail.com wrote: > In this email I want to hyptothesize on what a snapshot might be in the hope > that others can correct / amplify it when I go wrong. Nitpicking mode on. > I suppose I could copy the entire contents of > whatever I wanted to make a snapshot of (by any of a

Re: Explaining snapshots (for backup)

2022-11-15 Thread paulf
On Tue, 15 Nov 2022 09:40:11 -0500 Dan Ritter wrote: > rhkra...@gmail.com wrote: > > I'm not really clear on the concept of a snapshot (for backup) -- > > I've done a little googling but haven't found an explanation that > > "satisfies" me. > > > > Starting from a beginning, I suppose I could

Re: Explaining snapshots (for backup)

2022-11-15 Thread Dan Ritter
rhkra...@gmail.com wrote: > I'm not really clear on the concept of a snapshot (for backup) -- I've done a > little googling but haven't found an explanation that "satisfies" me. > > Starting from a beginning, I suppose I could copy the entire contents of > whatever I wanted to make a snapshot

Re: Explaining snapshots (for backup)

2022-11-15 Thread DdB
Am 15.11.2022 um 15:27 schrieb rhkra...@gmail.com: > I'm not really clear on the concept of a snapshot (for backup) -- I've done a > little googling but haven't found an explanation that "satisfies" me. I am familiar with snapshots on zfs. There might be different meanings in other contexts, idk

Explaining snapshots (for backup)

2022-11-15 Thread rhkramer
I'm not really clear on the concept of a snapshot (for backup) -- I've done a little googling but haven't found an explanation that "satisfies" me. In this email I want to hyptothesize on what a snapshot might be in the hope that others can correct / amplify it when I go wrong. Starting from a