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

[John E. Malmberg]

On 6/20/2016 7:34 AM, Stephen Hoffman wrote:
> On 2016-06-20 02:47:55 +0000, lawrencedo99 at gmail.com said:
>
>> rsync does all that and more.
>
> No version of rsync I've met or read about maintains a history of and a
> delta of the file changes over time within the backup target, nor does
> any version allow file or directory or disk restorations based on the
> original backup time.  rsync is a nice tool for folks using the command
> line and that want to synchronize directories.   But it's not directly
> analogous to Time Machine.

I have seen rsync cause cause more WAN overhead because of lack of 
understanding what it does.

If you use rsync like a copy command (no remote daemon) over a network 
shared drive to do an update, it can actually read every byte of the 
remote files over the network, even if all files are up to date.

The problem gets worse if one side is Windows or OpenVMS and the other 
Linux, because there seems to be some issues with converting a those 64 
bit timestamps to the 32 bit Linux systems.  I have not had the time to 
chase that down.

Regards,
-John
wb8tyw at qsl.net_work