[nSLUG] [NSLUG] Re: USB stick for backup okay?

Rory rory at unixism.org
Thu Mar 29 21:46:24 ADT 2018

That's some powerful rsync-fu, I like it.

Just to throw in my $0.02 worth:

I've tried various schemes throughout my digital life. In the end, I've 
been won over by the magic of hard links and online backups that can be 
easily browsed in-place with nothing more than ls or a file manager.

I really like Apple's TimeMachine (not something I'd say about many 
Apple products), it 'just works' and is easy enough for all family 
members to use. Sadly, I can't quite get to a fully FOSS household (yet) 
so TimeMachine wins for the Mac. For all the other bits (primarily Linux 
+ a smattering of NetBSD and OpenBSD) I use BackInTime. It offers pretty 
much the same results as TimeMachine and 'just works'.

With both Linux and Mac I have backups that I can browse easily. I can 
pick any date and go to a complete filesystem exactly as it was that day 
using any file utility I choose. This is very confidence inspiring 
compared with large tarballs or non-portable formats.

For storage I have a NAS (FWIW: a Thecus N5500, tossed the original 
firmware, installed Debian) with 5 drives in RAID6 + LVM. This is the 
primary backup box, media server, print server and dumping ground for 
shared files. I have two other portable drives that I rotate 
periodically. I use them to backup the most critical bits off the NAS, 
there's always one at home and another at the office. So far I've never 
needed to recover from the portable drives in spite of burning through a 
couple of disks in the NAS (RAID is beautiful when it works).

This is a lot of mechanical disks to feed and care for but the $$ per GB 
works for me. I outgrew optical media long ago; having backups spread 
across multiple removable disks just got annoying and the DVD stacks 
started to really add up.

On 2018-03-28 08:42 PM, Dave Flogeras wrote:
> On Wed, Mar 28, 2018 at 2:21 AM, Mike Spencer <mspencer at tallships.ca 
> <mailto:mspencer at tallships.ca>> wrote:
>     Long ago, I cluelessly tried to do a backup on a FAT stick.  Someone
>     here offered a friendly clue reminding me that it was normal for Foo,
>     foo and FOO to be the same file under FAT.  I created an ext2 fs on
>     the stick.  (Ext2 because I'm running an old kernel that doesn't grok
>     ext4.  When main box finally gets an upgrade, so will the backup
>     stick.)  Now, initial backup with cp, then a script to do rsync.
>     So, maybe I should periodically alter the backup script to add the
>     --checksum switch to rsync?  AIUI, that would force rsync to verify
>     matching MD4 checksums for a file on my HD and the backup copy
>     I made (say) last year.  That would force full read of all 2.9G in
>     /mnt/usb/backup, catch and update any defective files, but reading
>     wouldn't "refresh" the files found to be okay at the moment, would it?
>     Thanks, all.  Further comment/pointers welcome.
> This is also worth looking at.  I'm sure I've posted before, but in 
> case of new people, here we go again.
> Poor man's time-machine:
> http://www.mikerubel.org/computers/rsync_snapshots/
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