Backup

[Charles T. Bell]

On 11/03/2016 10:56 AM, David Fletcher wrote:
> On Thu, 2016-11-03 at 15:28 +0200, Errol Sapir wrote:
>>
>>
>> On 11/03/2016 10:29 AM, David Fletcher wrote:
>>> PS
>>>
>>> I never, ever use graphical tools to copy/move large numbers of
>>> files.
>>> They just don't seem to be reliable for this and even Linux desktop
>>> graphical tools fall over in my experience. OTOH terminal type
>>> tools
>>> such as rsync always work.
>>>
>>  If one knows the various definitions to use in rsync I'm sure it is
>> the one of the better solutions. I am too new to rsync to risk it on
>> something that is so vital as all my data unless I can be hand-
>> held.:-[
>> Errol
> 
> Basically, all you need is rsync -av. It can work just within your
> local computer or across your network. For example, this is the command
> that it is embedded in a script that automatically grabs a copy of what
> is on my server:-
> rsync -av --delete --bwlimit=20000 root at server:/home/
> /home/dave/backups/server/copyofslashhome/
> 
> but all you need for your purposes as a beginner is probably something
> like
> sudo rsync -av --delete /home/ /media/YourBackupDevice/
> 
> using sudo so that you can access home directories other than your own.
> I think that should work. To get the networked example to work I use a
> trick with something called ssh keys. As a beginner don't worry about
> that for now, just be aware that there is something you can use to get
> access to the content of other computers.
> 
> If you're worried, set up a test directory to play with, and experiment
> with leaving out --delete and keeping it in, but rsync will not alter
> the source directory.
> 
> Dave
> 

I have a program called 'cheat' that allows me to get info on some
common commands at the commandline.  The following is a copy of what
cheat has on rsync:
# To copy files from remote to local, maintaining file properties and
sym-links (-a), zipping for faster transfer (-z), verbose (-v).
rsync -avz host:file1 :file1 /dest/
rsync -avz /source host:/dest

# Copy files using checksum (-c) rather than time to detect if the file
has changed. (Useful for validating backups).
rsync -avc /source/ /dest/

# Copy contents of /src/foo to destination:

# This command will create /dest/foo if it does not already exist
rsync -auv /src/foo /dest

# Explicitly copy /src/foo to /dest/foo
rsync -auv /src/foo/ /dest/foo


Tom Bell
-- 
"Labor is prior to, and independent of capital. Capital is only the
fruit of labor, and could never have existed if labor had not first
existed.  Labor is the superior of capital, and deserves much the higher
consideration. "
--Abraham Lincoln, part of 1861 address to congress
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