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diff --git a/TODO b/TODO
index 7eec963..8149c64 100644
--- a/TODO
+++ b/TODO
@@ -1 +1,14 @@
 Add 'real' disk usage to db format so that sparse files are packed efficiently.
+ - A sparse file takes up less disk space than the size of the file.
+   Currently, lsbackups calculates enough space to include the whole thing on
+   the CD.  With an ext2 filesystem there is no need to do this.  It only needs
+   to reserve enough space for the actual disk usage.
+ - This might not be true if the target image uses an ISO fs.  I should do some
+   looking into this.
+
+If a file has multiple hard-links then this is not handled efficiently.
+lsbackups should only calculate space on the target filesystem for one
+copy and actually preserve the hard-links.  This will save space and
+make restore more accurate since the hard-links will still be there
+after the restore.
+