-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 14-Oct-2013 21:53 , Roman Mamedov wrote: > Sure, that's one of the more awesome uses of btrfs. > > But keep in mind that old snapshots on the same FS are not to be > used instead of a proper backup to external media/servers. If a > block happened not to change for a year, and it gets damaged on > disk, it will become damaged in all the snapshots all the way back > to a year ago, and you lose that data. I haven't looked at the wiki carefully enough to understand this, but could one reasonably back up the snapshots of one BTRFS filesystem to an independent BTRFS filesystem, in a more efficient way than just dump/restore or cpio or something? It sounds like you could rely on on-the-fly deduping to save space on the backup filesystem, but you'd still be reading the whole source snapshot tree and sending it to be deduped/written. Seems like you could improve things by just pulling the changed blocks from the snapshot to the previous snapshot, which would (I guess) be the only blocks actually _in_ the snapshot. I guess what would really help is a "Best Practices Guide for BTRFS Snapshotting and Backup." Does anything like that exist? Thanks, - -- Mersenne Law LLC · www.mersenne.com · +1-503-679-1671 - - Small Business, Startup and Intellectual Property Law - 1500 SW First Ave. · Suite 1170 · Portland, Oregon 97201 -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.20 (Darwin) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBAgAGBQJSXM0RAAoJEIQakGgVoKPCbNUP/RppplehqwASZXuIHcVGZBW/ 4Q0sKcA19O4VVW8/Byy5Wa1cH3DHf24X4S8IHdZIvdn30EfYNI7q489ldmwQk9h8 To2EdsbpG9VlRWQ6W3zSv1iwqp1i/1W1miB6dkk4hHIEZ64BilaFyKInuCJCdS1T anQFmFBUMGbMGdMXbIxrLgHhwYr7VSyp4RXxtCspeQHENT1zUiy6tyzEDqoP5vf+ ZDScBXK8G/MFijQTr6BWfCyiuS3OFostCp9dITmwNtLc194Ae/TDF7+ZNo/CzpOy uP4pEZDPBYraEEcZBeRm5Jefa6VPkr16aoiJKjEH0StHimuHDNX17epgLTqSJx+J JN0AJoxLxHQa7A8ny3aOzIjibKGP0Aa8KBfl6saRD8DMFtILHLMPCUOJ+l16Pcj/ gfipOZEpiBDHY4EIzYJRq/yYMHmw5SrvZeoPKdIPgDjJ7ovB9fteTwmLVSaiccM0 nd7TTMYiqm6PPnh7FEZWopfMEvx35LSxxI5Q6nuNqgQ33EgtYtM5yJC1cISJH1gf HwQWmr2yqwZ/xgEQc0jI4LO6ISTx4xsY0NKM5aUr6ayzbmE5kRRfnNkUKpDd8by9 CpuFg898XIO+9Cd9do0MvLjVxg62WU8YxPiC+bcwc5tGKAiVjQaTeTyfYrLDmGaj sGCmWIXC8dGrrqsaGthw =ioaG -----END PGP SIGNATURE-----
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