Hi Marc, Please read the FAQ before filing a bug report: http://www.nongnu.org/rdiff-backup/FAQ.html#free_space
If a previous backup has failed, or you are performing a restore operation, rdiff-backup needs temporary space to assemble the correct version of each file. The amount of free space needed will depend on the size of your largest file. (It can need up to 2x as much free space.)
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