Re: ¿Is there any Emergency RD (Disaster and Recovery) - Backup System available
dant said:
Just some thoughts to ponder...
Does it matter where you put your systems, as all
nodes (co-locations) ...
Sure it does, the physical location is a master piece when designing a network infrastructure. Sorry if I do not enter in details with samples.
dant said:
nodes (co-locations) are most likely controlled and
very tightly at that? Is not your OS most likely to be
loaded with all sorts of "back-doors" for the benefit of
the security-states to peruse and control as it deems fit?
I'm sure the Powers That Be are fully capable of a "tight control". It is not about avoiding it completely, but fighting it. There are a lot of interesting tips and tricks that can be useful.
About "back-doors". Sure, a lot of them are present, nonetheless mostly on Windows. On Linux also but a diverse multifaceted hybrid system make difficultier to control. If you want an extremely powerful and secure system, then you may go choose a Linux Distribution like "Gentoo" using the Hardened patch. This is you download the source code of everything and start compiling it all (36 hours effort for a base install). No source code is equal to "no install". If you want a default binary system then may be a "Debian" Linux Distribution "stable version" is good choice also. Sometimes it pass up to several years untill a package is tagged as stable (when no bugs are found). This years delay, means using "old software", no updates, slowly manual updates and as a consequence: 'more control', 'more safety' (so to speak).
dant said:
Can you honestly say that these things were done
accidentally or intentionally?
Both.
dant said:
For me, the only reason I do backups is when there
is a hardware or software failure that causes the loss
or corruption of data that renders your OS unusable.
Is it quicker to restore from backups (if you can) than
it is to rebuild from scratch?
I do backups. Now fewer as hard disk drives become "safer". Some with SMART technology that warns you before "stop working", so an emergency backup is somewhat possible. I have now 13 active hard disks, the 7 most important are within a stopped computer (only active when backing processes are required). Another disk is always stopped and not connected to any electric device (in a wardrobe).
For me a backup is mainly for data, not for software application. An incremental backup is speedy, not a typical full-copy, better having a 'backup only new differences'. A full-copy technique applied frequently may also affect the hardware, penalize online service and of course deteriorate hardware average life expectancy.
The only software backup which I recommended is a basic image to restore the system whenever needed. A hard disk partition with basic software installed. Nowadays on new generation hardware systems, Virtual Servers are sold around the clock. The present and future technology. You can have 'nn' servers sharing the same hardware.
Note: it also recommended to have a backup of the original software before installation, to repeat the installation process whenever needed (with documentation if required). Do not rely on CD/DVD media as it deteriorates with time, temperature, humidity and other factors (fungus eats media). And remember that any software has a roadmap with a specific commercial 'End-Of-Support'. So one day you can wake up without any support at all. The company is exempt as newer contracts have a clause warning about this end-of-support rule.
dant said:
As for viruses, backdoors, etc., is this a tiger chasing
it's own tail - as one really does not have much control
in completely preventing or eliminating malware as it
most likely was put there from the very beginning, when
you installed your OS & software?
Interesting quote and concept. A virus AS IS do not exist. It is an application, a program, that do what is expected to do. No secret at all. ¿Why an Operating System or application let to an unknown program do whatever it ask for? Because it is in its core design. Seek information about "Word" application within the "Office" application suite. Ask why "macros" exist, an interesting software design (not very secure!).
A question: ¿Why 99% of viruses run on Windows?
An interesting clue: ¿may be because they need a defective Operating System design?
Tech.Note: some new viruses and back-doors appear on commercial applications that are being ported to Linux (and already exist on Windows). The defective design are also ported to Linux.
dant said:
With the advent of TeraByte drives these days, it most likely
requires TeraBytes drives for backups, and to preserve the
backup drive, one ought to remove the drive from the system
and to secure it protectively, and yet, there is no guarantee
that attempts to restore your data will be successful at the
time when you need it most?
Better designs are available. You propose to restore the original data into the original system.
A lot of options available, please understand my tiny summary:
- hard disk failure: RAID systems (1-mirror, 5-6 multi spain disks).
- enterprise system redundancy: some systems have hot swappable everything (processors, disks, 2-3 * power supply units). Also memory ECC that can "kill" defective chips 'so to speak' and remove them from the available memory.
- system redundancy: cluster (several machines with same software and data). Type: active-passive, or active-active.
dant said:
I have done restores many, many times, from (old) tapes to hard
drives when it comes time to do restores, I have ended up with
broken tapes, corroded tapes, broken or blown up hard drives
simply by plugging it into a bad power supply, or when the medium
is no longer retrievable, due to missing or no longer existing backup
software, due to an incorrect backups, due to entropy, or simply due
to the "Act of God"? The list is endless.
Tapes is a very bad design since its conception, like the CD/DVD media set. Also USB/Flash is not good right now. Some extremely interesting breakthrough near the corner now but this is not the proper topic to talk about.
Hard disk is the key because it is not a unit to backup, it is a unit to work with 24h a day (for years). Instead of buying one unit, you buy pairs (at the same time). See that any legacy backup system is founded on the idea: cheaper than the hard disk drives. Now this premise is not longer true.
Tech.Note: you can buy now 2TB disk units with adaptative speed.
Sorry for the long reply. Expect to provide useful answers to your questions.
Regards,
Jordi