Accessing LXC container's filesystem from host

I use the following method for backup using rsync:

Using the pid of the container's init process, you can get it using

# list all hosts:
lxc-ls -f -Fname,pid

# or get pid of one host:
lxc-ls -f -Fpid mycontainer
PID    
-----
13323

Using this information, you can access the host's rootfs using the /proc filesystem.

cat /proc/13323/root/etc/hostname
# returns: "mycontainer"

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