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On 11:18 Thu 13 Mar , Iain Buchanan wrote: |
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> |
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> On Tue, 2008-03-11 at 23:10 -0500, forgottenwizard wrote: |
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> |
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> define "unneeded". This is highly system dependant, as everyone puts |
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> important files all over the place. |
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> |
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Things I would lose if I backed them up. Doing a prior backup, some |
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files in /proc caused me problems, and rsync refused to delete anything |
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in the following pass. |
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> |
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> from the subject line I assume you want to be able to restore a bootable |
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> system? If so, you may need to back up more than just filesystems. |
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> What about the partition table and the master boot record? You can back |
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> up the mbr to a file by using dd: |
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> $ sudo dd if=/dev/hda of=mbr.img bs=512 count=1 |
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> (replace hda with your boot drive). |
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> |
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The table, mbr, and partition table I'm not worried about. Those can be |
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easily repaired (or replaced, depending on how one wants to do it) |
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|
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> In terms of Gentoo, you can strip out /var/tmp /usr/portage /home and |
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> possibly /opt. Probably some /var subdirs too like /var/log /var/www |
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> etc and some /usr subdirs like /usr/games /usr/include /usr/src etc. |
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> |
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> I'd say you _need_ /dev /proc and /sys. |
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I'd like to know why. Some of the files in /proc change often, and cause |
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rsync a problem. sys doesn't cause these problems, though. |
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> |
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> If you _really_ want to know for sure, turn on the atimes option in |
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> fstab for all your partions, then reboot and do a bit of stuff (log in, |
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> ssh, etc). Then use `find` to find all files that were accessed. |
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> Something like this: |
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> |
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> * edit /etc/fstab, delete noatime (replacing it with "defaults" if |
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> no other options remain) |
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> * $ touch /var/tmp/reference |
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> * $ shutdown -r now |
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> * log in, look around |
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> * find / -anewer /var/tmp/reference |
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> |
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> The output from the last command will be everything you _need_ to boot. |
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> |
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> Ideally, when backing up /proc /dev and /sys, do so from a cleanly |
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> shut-down system. |
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> |
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> HTH, |
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I'm trying to do this with the system booted up, because doing a daily |
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sync like that would be a bit of a pain. |
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-- |
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