Backup Solution

[Jerry McAllister]

On Fri, Sep 28, 2007 at 06:11:14AM +0000, dhaneshk k wrote:

> Hi  everybody ,
> 
>   I like to know the different backup techniques that is very cheaper (I 
> cant go for a SAN, mirror ..  even if I can purchase those,please excuse me 
> because I believe more productivity @ less resources )for my webserver, but 
> any solution logicaly the cheapest one ,by which I can restore all the data 
> that I have just before the server crash(if it occurs)
> 
> What I followed was I configured a crontab in mydesktop PC which will run  
> rsync utility through ssh  to my webserver at 23 rd hour of  a day . so I 
> can get incremntal backup of the directories and database ( that I 
> configuerd for rsync )daily .
> 
> But I want a solution through that I can restore my server without any data 
> lose (ex: if the server crashes at 23.30 hour  then that 30 minutes data I 
> lose ).

You are stuck with some kind of real time mirroring then.   There is no
backup solution that doesn't have at least a little lag.   There are
also socalled 'bare-metal' solutions such as Acronis, but in some sense, 
they are also a form of mirror/softupdate/journaling that may cost you 
possibly more than you want - given what you say above and are still 
vulnerable to a physical disk failure without additional backup and if 
you have to revert to one of those backups, then you have that lag loss.

A mirror of a checksumming raid with periodic backups is probably the 
best you can get without getting in to huge money.   The only question
is your backup media.  Tape is the old standby and still works, but
takes a long time.   Additional large disks are becoming popular because
they are fast and easy but can get expensive when the dump takes more than
one for a full dump.

////jerry

> 
> So many  experts   here in this mailing lists can suggest their techniques 
> for a full system recovery(& backup solutions) after the crash without  any 
> data lose.
> 
> Your kind responses will help me lot
> Thanks in advance
> KK
> 
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