Exdupe with stdout ?!

[shazzla]

In theory ,yes. It supports :

eXdupe 0.5.0 BETA. Copyright 2010 - 2013 eXdupe.com. UNSTABLE UNSTABLE

Full backup:
[-vxarctpmgl] [-f] [-s] <sources> <destination>
[-vxarctpmgl] <-stdin> <filename to assign> <destination>

<destination> can either be -stdout or a file. Use .full as file extension

Differential backup:
-D[vxarctpl] [-f] [-s] <sources> <.full file> <destination>
-D[vxarctpl] <-stdin> <filename to assign> <.full file> <destination>

<destination> can either be -stdout or a file. Use .diff as file extension

Restore full backup:
-R[vo] <.full file> <destination directory | -stdout> [files]
-R[vo] <-stdin> <destination directory>

[files] is one or more files, drives or directories to restore, typed as
provided by -L flag

Restore differential backup:
-RD[vo] <.full> <.diff file> <destination directory | -stdout> [files]
-RD[vo] <-stdin> <.diff file> <destination directory>

[files] is one or more files, drives or directories to restore, typed as
provided by -L flag

List contents:
-L <.full file | .diff file>

Flags:
-r Do not include sub directories
-o Overwrite existing files (default is to abort)
-c Continue if a source file cannot be read or does not exist (default is
to abort)
-xn Use compression level n for traditional data compression applied after
deduplication. Set n = 0 for none (lets you apply your own), x = 1 for
QuickLZ, x = 2 for zlib or x = 3 for bzip2 (default = 1)
-p Include named pipes
-l On *nix: Follow symlinks (default is to store link only). On Windows:
symlinks are always followed - storing link only is not supported
-a Store absolute and complete paths (default is to remove the common
parent path of items passed on the command line)
-s"d:" Use Volume Shadow Copy Service for local drive d: (Windows only)
-f"s" Filter files using a script, s, written in the Lua language
-gn Use n GB memory for a hash table (default = 1). Use -mn to specify
number of MB instead. Use 1 GB per TB data for best compression ratio
Differential backups will use the same memory as the full backup
-tn Use n threads (default = 8)
-vn Use verbose level n for n = 0...9 (default = 8)
-- Prefix items in the <sources> list with "--" to exclude them.

Quick example of backup, differential backups and a restore:
exdupe z:\database\ database.full
exdupe -D z:\database\ database.full database.diff1
exdupe -D z:\database\ database.full database.diff2
exdupe -RD database.full database.diff2 z:\database\restored\

More examples:
exdupe -stdin database.mdf -stdout < database.mdf > database.full
exdupe -m256t2 z:\vmdk\win\ z:\vmdk\mac\ z:\vmdk\hpux\ servers.full
exdupe -RD servers.full servers.diff z:\restored mac win
exdupe -c -f"return(dir or size < 1000000)" z:\stuff stuff.full
exdupe -s"c:" c:\ --c:\pagefile.sys system.full
exdupe -R data.full -stdout > data.xml