Hello all,

My first post on the list. I thought I would start with something that I started

to think of as 'essential' after losing 90GB of data. Now I have two main

questions in mind: what to and how to back up on gentoo most efficiently.

1. Apart from users' home directories and the followings, what should be backed

up on a gentoo machine? 

/etc/portage/

/root

/var/lib/portage

...?

2. Erm..okay, I am gonna say, what magic I want and then ask your way.

I first started making gzipped tar balls as follows:

tar czpf /media/backups/userA-`date +%Y.%m.%d`.tgz -X userA-excludelist /etc

But these can get huge especially for home dirs. I also want safe dvd copies. 

Though I can find enough space on the external drives, I don't trust them

any more. See above..sigh..(No I recovered about one third of it with testdisk/photorec  

which names them as file000001 file00002.. and half them are zero sized.. which 

quite justifies my agony)

Here is what I wanna do. I want to have only one big backup for, say,

userA-2010.08.07.tgz and other small backup tars containing only the

files/folders that were modified since last update, 2010.08.07, as

userA-diff-2010.08.14.tgz, userA-diff-2010.08.21.tgz,  userA-diff-2010.08.28.tgz

etc. Now if I want to take the userA back to the future, 2010.08.21,  I want to

do it by first extracting the huge tar userA-2010.08.07.tgz and then the tiny

backup userA-diff-2010-08-21.tgz. 

But the thing is I don't know how to do this. I am hoping maybe you can tell me 

how to of it as well as a better way of doing backups. 

By the way, since I want dvd backups as well, and I want to use +rw dvds so I 

can overwrite old backup after a while, what is best way of ensuring the 

integrity and safety of them. Is it a good idea to use truecrypt containers? Or 

nothing tops signing and encrypting with gpg?