intrigeri,

Just an update to share that I:

- created a new Tails flash drive with persistence
- converted the new  persistence to btrfs
- booted my usual Tails flash drive and backed up it's persistent volume to the 
newly created Tails drive
- installed btrfs-progs on the new Tails drive

At this point, everything about this btrfs persistence volume appears to work 
normally. I can create subvolumes there and snapshot them. Tails appears happy 
and, from a user's perspective, nothing appears to have changed.

Instead of creating a folder named "Persistent", a production-ready Tails with 
btrfs could create a subvolume named "Persistent". Snapshots of this subvolume 
would then capture the state of the user's data at modest cost to storage 
space. Backing up the user's data would involve a Tails backup drive and one 
btrfs send / receive operation*.  

I intend to put some miles on this new Tails btrfs flash drive.

regards,
alienpup

* Using snapshots, a single Tails "backup" drive could accommodate as many 
backups as space permits.
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