Re: [gentoo-user] {OT} Allow work from home?

[Rich Freeman]

On Tue, Jan 19, 2016 at 5:22 PM, lee <lee@××××××××.de> wrote:
> "J. Roeleveld" <joost@××××××××.org> writes:
>
> How does that work?  IIUC, when you created a snapshot, any changes you
> make to the snapshotted (or how that is called) file system are being
> referenced by the snapshot which you can either destroy or abandon.
> When you destroy it, the changes you made are being applied to the
> file system you snapshotted (because someone decided to use a very
> misleading terminology), and when you abandon it, the changes are thrown
> away and you end up with the file system as it was before the snapshot
> was created.
>
> In any case, you do not get multiple versions (which only reference the
> changes made) of the file system you snapshotted but only one current
> version.
>
> Do you need to use a special file system or something which provides
> this kind of multiple copies when you make snapshots?
>

And that is exactly what zfs and btrfs provide. Snapshots are full
citizens.  If I create a snapshot of a directory in btrfs it is
essentially indistinguishable from running cp -a on the directory,
except the snapshot takes only seconds to create almost entirely
regardless of size, and takes almost no space until changes are made.
Later I can delete the snapshot, or delete the original, or keep both
indefinitely making changes to either.

-- 
Rich