Msg#: 4196413 posted 6:31 am on Sep 7, 2010 (gmt 0)
Depends on your requirements.
For desktop use I only keep /home in sync. For a server you might want to keep other directories in sync as well. Where is your (valuable) data? Do you have time to do a re-install to recover, or do you need to be able to swap drives and keep going?
I only do this for desktop use so I cannot confirm how well it works if your requirements are more extensive,
On my server I have two internal SATA drives, the first is partitioned and takes the operating system and primary copy of my work which is mount as work. I then formatted the second drive and mounted it as backup. Crontab then runs a backup script each night to ensure that I have a backup for everyday of the week therefore I have 7 days to realise a mistake.
In addition, I also have a LACIE USB hard-drive which acts as a removable copy which I can take off-site. The backup script e-mails me each morning to tell me if the backups were successful so that I can address any issues, the most common is that the LACIE has been powered down for one reason or another.
Although there is no way to remain 100% covered for everything I find the best policy is to change the drives in my server every 3 years or if any signs of bad sectors start appearing.