[[!tag obnam announce]]

I've just released version 0.27 of Obnam, my backup application. The relevant part of NEWS:

• The repository format has again changed in an incompatible manner, so you will need to re-backup everything again. Alternatively, you can try the new convert5to6 subcommand. See the manual page for details. Make sure you have a copy of the repository before converting, the code is new and may be buggy.
• New option --small-files-in-btree enables Obnam to store the contents of small files in the per-client B-tree. This is not the default, at least yet, since it's impact on real life performance is unknown, but it should make things go a bit faster for high latency repository connections.
• Some SFTP related speed optimizations.
• Data filtering is now strictly stable and priority-ordered, ensuring that compression always happens before encryption etc.
• Repository metadata is never filtered, so that we can be sure that in future if when we add backwards-compatibility we can detect the format without worrying about any other filtering which might occur.
• Forcing of locks is now unconditional and across the entire repository.
• Uses the larch 0.30 read-only mode to fix a bug where opening a B-tree rolls back changes someone else is making, even if we only use the tree to read stuff from.
• "obnam backup" will now exit with a non-zero exit code if there were any errors during a backup, and the problematic files were skipped. Thanks, Peter Palfrader, for reporting the bug.
• "obnam forget" is now a bit faster.
• Hash collisions for filenames are now handled.