On Fri, 15 May 2015 01:35:55 PM Craig Sanders wrote:
> On Fri, May 15, 2015 at 12:35:39PM +1000, Carl Turney wrote:
> > Prior to doing the complete system backups (as outlined in my last
> > email), I enter Firefox and clear all history.
> 
> why? it's not going to make that much difference in time taken or space
> consumed.

I don't know about Mozilla, but my Chrome cache is about 500M on the laptop 
I'm using now (which wouldn't rank higher than 3rd place for active web 
browsing systems I run).  That makes a difference in space used.  I think that 
Chrome isn't particularly good about managing the cache, for example I think 
that the cache file from last year is very unlikely to be of any use.

500M+ of rapidly changing data for each of 3 systems makes a real difference 
when I'm storing incremental backups on a 500G disk!

One thing I've been planning to do is to create a separate BTRFS subvolume for 
~/.cache, that would exclude it from the BTRFS snapshot backups as well as the 
removable media backups (which are from the snapshot backups).

> > But, during the backup (after booting into Recovery mode), rsync
> > displays the copying of MANY files within this directory...
> > 
> > /home/user/.cache/mozilla/firefox/abcd1234.default/cache2/trash/3363925
> > 
> > Given the names of some of those directories, I wonder if it is safe
> > to delete them (rm -r) just before the backup?
> > 
> > If so, at which level... trash? cache2?
> 
> anyway, there's no need to delete before backing up, just tell rsync not
> to backup that directory.

Of course a decision to not backup files means that the application won't have 
access to them after a restore.  So it's worth knowing what happens if you 
delete them.  A quick test would be a good idea.

-- 
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