I've been using my own scripts
http://digitalkingdom.org/~rlpowell/hobbies/backups.html to remotely
mirror backuppc's date in an encrypted fashion.

The problem is, the time rsync takes seems to keep growing.  I
expect this to continue more-or-less without bound, and it's already
pretty onerous.

So, I need to find a way to rsync on a per-file basis, but still be
encrypted.  Hence, questions:


1.  Does anyone know a way to mount a filesystem so that only one
process can see it?  If I could do that, I could have an encrypted
loop filesystem mounted remotely for rsync's sole use, and just
rsync into that.  I'm not willing to have the encripted filesystem
mounted globally on the remote machine, as I am not the sole user,
nor do I own it.

2.  Does backuppc ever change pool files (rather than simply replace
them)?  If the answer is no, I don't need to worry about the
rsync-friendliness of any per-file encryption method I might use.

3.  Ignoring logs and such, is anything outside of the pool or cpool
dir ever *not* a hard link into the pool/cpool dir?  If the answer
is no, then per-file encryption is relatively easy.  One way is to
rsync -H a copy of all backuppc data and encrypt each pool file (in
a way that doesn't break hard links) and then rsync that encrypted
copy out remotely.  Another way is to roll encryption in to the
backuppc compression program.

Can anyone think of other ways to solve this problem?

Thanks.

-Robin

-- 
Lojban Reason #17: http://en.wikipedia.org/wiki/Buffalo_buffalo
Proud Supporter of the Singularity Institute - http://singinst.org/
http://www.digitalkingdom.org/~rlpowell/ *** http://www.lojban.org/

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