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

[Stephen Hoffman]

On 2016-06-20 10:13:41 +0000, lawrencedo99 at gmail.com said:

> rsync basically answers the question “given a source directory «src» 
> and a destination directory «dst», what is the minimum that needs to be 
> done to the contents of «dst» to turn it into an exact copy of «src»?”

Which is only part of what Time Machine does.  You're obligated to 
maintain multiple rsync targets, if you want any depth to your backups. 
  Time Machine functions more like a VCS here, in that a single target 
contains anything from a single version of the source to months or 
years of source file changes, with file, directory or everything 
restorable by time.  Time Machine also avoids storing multiple copies 
of unmodified files, where using multiple rsync targets would require 
the storage system to do that de-dup.

Take rsync and combine it with a VCS — and with a much simpler and 
backup-targeted user interface — and you'll get closer to Time Machine.



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