ecryptfs size different from home directory size

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I'm puzzled. My harddisk is full and most of the space is used by .eryptfs/$MYUSERNAME (810.4 GB). Strangly, my home directory /home/MYUSERNAME (22.2GB) consumes significantly less diskspace. Any idea what is wrong or where to look for the "missing" free space?

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eCryptfs slightly pads files, and the overhead of encryption will slightly increase your over all disk usage, but certainly not to the degree you describe, 37x!

The only disk usage that really matters is that of your /home/.ecryptfs/$USER directory, which is really where the encrypted files are stored on disk. What you're seeing in terms of the usage of $HOME is really phantom -- the cleartext decryption of those files only appears in memory, and not on disk.

To see your true usage, use:

df -h /home
du -sh /home