> it is better to have efficient backup tool. (but not exists yet though) > cwfs is not so easy to backup compared to venti. > venti is easy to backup because filled areas are shielded and guaranteed not > to be modified. > but cwfs is not. unwritten blocks exist in deep dumped area. > these blocks might be written in future.
untrue. these unwritten blocks are never used. the dump consists of only blocks with a waddr greater than the last superblock's waddr. /sys/src/fs/dev/cw.c:/^dumpblock is a good reference. - erik
