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

[lawrencedo99 at gmail.com]

On Monday, June 20, 2016 at 5:39:08 PM UTC+12, Paul Sture wrote:
> On 2016-06-20, Lawrence D’Oliveiro 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.

rsync doesn’t need one.