Hello DoM,
RTM
It is very well written and answers alot of questions about how BackupPC runs and things it does in the background.
File name mangling
Backup file names are stored in ``mangled'' form. Each node of a path is preceded by ``f'' (mnemonic: file), and special characters (\n, \r, % and /) are URI-encoded as ``%xx'', where xx is the ascii character's hex value. So c:/craig/example.txt is now stored as fc/fcraig/fexample.txt.
This was done mainly so meta-data could be stored alongside the backup files without name collisions. In particular, the attributes for the files in a directory are stored in a file called ``attrib'', and mangling avoids file name collisions (I discarded the idea of having a duplicate directory tree for every backup just to store the attributes). Other meta-data (eg: rsync checksums) could be stored in file names preceded by, eg, ``c''. There are two other benefits to mangling: the share name might contain ``/'' (eg: ``/home/craig'' for tar transport), and I wanted that represented as a single level in the storage tree. Secondly, as files are written to NewFileList for later processing by BackupPC_link, embedded newlines in the file's path will cause problems which are avoided by mangling.
The CGI script undoes the mangling, so it is invisible to the user. Old (unmangled) backups are still supported by the CGI interface.
Best regards,
======= At 2004-08-03, 01:56:17 you wrote: =======
Hi All,
I am a BackuPC newbie and i would like to have an info about Backup Format.
Backuppc works, but all the backups are in this format: f$dir .
All dirs and files have f in front of them.
How can i disable this f?
I mean i would like to restore files also in other ways and not only by
BackupPC.
Thx & BYez DoM
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kevin oswald
koswald < at > pollyspies.com
2004-08-03
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