Re: backup package - linux
On Sat, 16 Apr 2005, Francisco Cesar da Silva wrote:
> Does someone know a simple backup algorithm (probably using several
> disks) that can resurrect a file or a set of files or a whole disk as at
> an arbitrary date in the past?
thats trivial as long as you can guarantee your backup files does
not contain corrupted files and that the backups are complete and correct
> Perhaps there is a package that manages this sort of thing?
not really .. at least not in my book, that i'd rather use my own
backup mechanism and methodology
my basic methodology ( craziness )
- i have(want) 3 copies of anything important
- i have(want) 3 independent backup such that if the backup
system takes a dump ... nothing is lost (real data or backup data)
- backups can go live at any time within say a minute
to take over the primary servers if it crashed
- i assume last few full backups failed and i can still recover
- i assume some daily incremental failed but not all
- i require a list of files that changed daily
- i want it to work across 50TB (terabyte) of data ... :-)
- i want it to work across any-all-nix and windoze
- i want to exclude stuff i dont care about
- lots more specs/requirements to weed out most apps
( all are real requirements .. )
- to do the above ...
find <todays change> | tar zcvf someplacesafe://today.tgz -T -
todays changes is the key .. whether it spans a day or
span a week or span a month or span 6 months
all that can be done trivially with find -mtime -xx
-mtime -8 last week
-mtime -32 last month
-mtime -200 last 6-month
...
- all of the above is a couple lines in cron if you do NOT
want to do any error checking etc and willing to risk all or
nothing
- i assume a cracker is not sleeping in the backups with the trojans
that the backups are clean and prestine and 100% guranteed functional
to be able to recover any system to any date(hour) at any time(hour)
rest of the "simple backup" stuff
http://linux-backup.net
c ya
alvin
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