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Recently I've noticed sudden grown of size of my encfs folder. Size of data 2.3 Gb, size of encfs folder is 6.6 Gb. What could cause this?

This is how mount output looks like:
/dev/sda6 on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/cgroup type tmpfs (rw)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755)
none on /sys/fs/pstore type pstore (rw)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
systemd on /sys/fs/cgroup/systemd type cgroup (rw,noexec,nosuid,nodev,none,name=systemd)
gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,user=user)
encfs on /home/user/data type fuse.encfs (rw,nosuid,nodev,default_permissions,user=user)
encfs on /home/user/lab type fuse.encfs (rw,nosuid,nodev,default_permissions,user=user)
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Could you please say what exact folder/fs takes 2.3 Gb and what 6.6 Gb. How did you calculate this? Also did you read this question? –  c0rp Feb 27 '14 at 15:06
@c0rp I've updated question with informations about filesystems used. I sync encrypted folder to the cloud storage and this time it gave me warning about space usage. Information about folder sizes on my local machine came from right clicking in nemo file manager and size of encrypted folder on my local machine and on cloud storage identical. –  Moonwalker Feb 27 '14 at 23:21

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