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problems with snapshot tools

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linux-howto

http://askubuntu.com – I am currently using ubuntu 11.10, it had deja dup pre-installed on the system, its a backup and restore utility, but it doesn't support snapshots. There is no such tool for snapshotting in ubuntu. I know that taking snapshots requires Filesystem support, are there any other problems associated ? I would like to know this. I want to write a system backup and restore utility which could have continuous backup so I want to know if any already exists. (HowTos)