[Info-vax] BACKUP, rsync, Time Machine (was: Re: Re; Spiralog, RMS Journaling...)

[Paul Sture]

On 2016-06-20, lawrencedo99 at gmail.com <lawrencedo99 at gmail.com> wrote:
> On Monday, June 20, 2016 at 2:47:43 AM UTC+12, Stephen Hoffman wrote:
>
>> rsync is somewhat analogous to Time Machine in that both copy files 
>> around.  But the two differ.  rsync is a remote synchronization tool.  
>> Time Machine is a backup tool, and maintains months or years of 
>> previous versions of files over one or more local or remote backup 
>> target volumes, as well as providing the ability to restore and boot 
>> the recovered volume(s), among other differences from rsync.  TM avoids 
>> storing duplicate copies of a file, though does not provide the file or 
>> sector-level de-dupling available with some storage systems.  Having 
>> used both, TM and rsync are different targets and different users and 
>> different implementations.
>
> rsync does all that and more.

Time Machine uses a File System Event store to track changed directories.

See the details here:

http://pondini.org/OSX/Home.html>

and

<http://pondini.org/TM/Works.html>

-- 
There are two hard things in computer science, and they are cache invalidation,
naming, and off-by-one errors.