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[Serge Hallyn <serge.hallyn@xxxxxxxxx>]

What the backup utility would do is to unshare a new mounts namespace,
mount / as MS_SLAVE|MS_REC, unmount any ecryptfs directories, and start
the backup.

(As always, I must point out that having proper keyring support is still far
preferable)

-- 
establish ro,bind mount of /home for backup purposes
https://bugs.launchpad.net/bugs/371719
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Status in eCryptfs - Enterprise Cryptographic Filesystem: Triaged
Status in “ecryptfs-utils” source package in Ubuntu: Triaged

Bug description:
This bug is similar to Bug #365596.

A commenter there had an excellent suggestion.  eCryptfs should, perhaps, add an entry to /etc/fstab that looks like this:

/home /.home-backup none ro,bind

This would ensure that encrypted copies of all files are available at all times to backup utilities at /.home-backup.

:-Dustin