Re: OT Tape backup recomendations - disks
On Tue, 4 Nov 2003, David Purton wrote:
> Actaully we'd probably risk it with 3 disks - so at any given time we
> have two full snapshots and then use the third disk for daily
> backups. So drves would be not such a bad option.
> Also does anyone know anything about these Mobile Rack Hard Disk bays?
if you use "mobile racks" ...
- you're gonna assume that those those are changed daily
- its working properly
those things caoses $5.00 - $100 depending on model and features
- there's no such thing as hotswap ide
( how do you know nothing was writing data to it ?? )
- its best to power down the box, and install the drive bays
- full backups takes too much space ... and hard to span a month or 6
months of backups when using only "full backups"
- only backup what you consider important data
( let's /home and /etc )
/usr and other system files are already on your original cdrom
possible 3 disk backup strategies ...
# assume yesterday's back or last weeks full backup was bad ...
# - what do you do ??
# assume your disk crashed on your backup servers
# - power surge ro something whacky
- put one disk in each of 3 different PCs
evenly spread all backups across all 3 disks
alternating and taking turns daily
- always do incremental backup since your last full backup +1
find /home /etc -mtime -8
( or a running count since full backups )
- always do incremental weekly backups
( spanning 2 full backups ( 21 or 30 days) of changes )
find /home /etc -mtime -22
- always do incremental monthly backups spanning 3 or 6 months
find /home /etc -mtime -93 ....
- incremental changes should be small ...
- if you have tons of *.MP3 or tons of *.larg-files, those
should be backed up separately to other "backup data disks"
and NOT backed up w/ system and corp data
- lots of ways for backups to fail .. ( tape or disks ) and how to get