OK this issue seems to be solved but there is a related question that pops up:
Does a full backup not use pre/post scripts? Have a look at this:
diff backup:
Start duply v1.5.5.5, time is 2014-10-18 18:00:01.
Using profile '/root/.duply/diladele'.
Using installed duplicity version 0.6.24, python 2.7.3, gpg 1.4.12 (Home: ~/.gnupg), awk 'GNU Awk 4.0.1', bash '4.2.37(1)-release (x86_64-pc-linux-gnu)'.
Autoset found secret key of first GPG_KEY entry '27A8AEC1' for signing.
Test - Encrypt to 27A8AEC1 & Sign with 27A8AEC1 (OK)
Test - Decrypt (OK)
Test - Compare (OK)
Cleanup - Delete '/tmp/duply.395848.1413648001_*'(OK)
--- Start running command PRE at 18:00:01.299 ---
Running '/root/.duply/diladele/pre' - OK
Output: rm: cannot remove `/var/lib/vz/backups/vzdump-qemu-105.*': No such file or directory
INFO: starting new backup job: vzdump 105 --dumpdir /var/lib/vz/backups --compress 0
INFO: Starting Backup of VM 105 (qemu)
INFO: status = running
INFO: update VM 105: -lock backup
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: creating archive '/var/lib/vz/backups/vzdump-qemu-105-2014_10_18-18_00_01.vma'
INFO: started backup task '0534f691-baa9-4afb-8940-7ecc67708102'
INFO: status: 1% (639434752/53687091200), sparse 0% (336650240), duration 3, 213/100 MB/s
INFO: status: 2% (1089601536/53687091200), sparse 0% (369156096), duration 9, 75/69 MB/s
INFO: status: 3% (1697447936/53687091200), sparse 0% (425742336), duration 16, 86/78 MB/s
INFO: status: 4% (2214985728/53687091200), sparse 0% (453791744), duration 23, 73/69 MB/s
INFO: status: 5% (2717908992/53687091200), sparse 1% (627212288), duration 28, 100/65 MB/s
INFO: status: 6% (3248422912/53687091200), sparse 1% (665989120), duration 38, 53/49 MB/s
INFO: status: 7% (3796238336/53687091200), sparse 1% (742617088), duration 48, 54/47 MB/s
INFO: status: 12% (6879182848/53687091200), sparse 6% (3646472192), duration 51, 1027/59 MB/s
INFO: status: 13% (7036469248/53687091200), sparse 6% (3648561152), duration 54, 52/51 MB/s
INFO: status: 19% (10654121984/53687091200), sparse 12% (6919897088), duration 60, 602/57 MB/s
INFO: status: 28% (15461449728/53687091200), sparse 21% (11499884544), duration 64, 1201/56 MB/s
INFO: status: 32% (17657036800/53687091200), sparse 25% (13569069056), duration 67, 731/42 MB/s
INFO: status: 33% (17820680192/53687091200), sparse 25% (13569077248), duration 70, 54/54 MB/s
INFO: status: 34% (18258526208/53687091200), sparse 25% (13615640576), duration 78, 54/48 MB/s
INFO: status: 36% (19715588096/53687091200), sparse 27% (14937714688), duration 81, 485/44 MB/s
INFO: status: 37% (19979960320/53687091200), sparse 27% (14943662080), duration 84, 88/86 MB/s
INFO: status: 40% (21772566528/53687091200), sparse 30% (16525926400), duration 88, 448/52 MB/s
INFO: status: 44% (24054530048/53687091200), sparse 34% (18616602624), duration 91, 760/63 MB/s
INFO: status: 52% (28362145792/53687091200), sparse 42% (22737588224), duration 94, 1435/62 MB/s
INFO: status: 72% (39047462912/53687091200), sparse 62% (33347510272), duration 97, 3561/25 MB/s
INFO: status: 85% (45634224128/53687091200), sparse 73% (39727550464), duration 100, 2195/68 MB/s
INFO: status: 92% (49433477120/53687091200), sparse 80% (43340783616), duration 103, 1266/62 MB/s
INFO: status: 100% (53687091200/53687091200), sparse 88% (47560859648), duration 105, 2126/16 MB/s
INFO: transferred 53687 MB in 105 seconds (511 MB/s)
INFO: archive file size: 5.71GB
INFO: Finished Backup of VM 105 (00:01:49)
INFO: Backup job finished successfully
--- Finished state OK at 18:01:50.410 - Runtime 00:01:49.111 ---
--- Start running command BKP at 18:01:50.443 ---
Reading globbing filelist /root/.duply/diladele/exclude
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: Sun Oct 12 23:00:06 2014
Reuse configured PASSPHRASE as SIGN_PASSPHRASE
--------------[ Backup Statistics ]--------------
StartTime 1413648121.25 (Sat Oct 18 18:02:01 2014)
EndTime 1413648199.30 (Sat Oct 18 18:03:19 2014)
ElapsedTime 78.04 (1 minute 18.04 seconds)
SourceFiles 2
SourceFileSize 6301224960 (5.87 GB)
NewFiles 0
NewFileSize 0 (0 bytes)
DeletedFiles 0
ChangedFiles 1
ChangedFileSize 6301220864 (5.87 GB)
ChangedDeltaSize 0 (0 bytes)
DeltaEntries 1
RawDeltaSize 30023639 (28.6 MB)
TotalDestinationSizeChange 3124295 (2.98 MB)
Errors 0
-------------------------------------------------
--- Finished state OK at 18:09:17.185 - Runtime 00:07:26.742 ---
--- Start running command POST at 18:09:17.223 ---
Running '/root/.duply/diladele/post' - OK
--- Finished state OK at 18:09:25.639 - Runtime 00:00:08.415 ---
full backup:
Start duply v1.5.5.5, time is 2014-10-19 23:00:01.
Using profile '/root/.duply/diladele'.
Using installed duplicity version 0.6.24, python 2.7.3, gpg 1.4.12 (Home: ~/.gnupg), awk 'GNU Awk 4.0.1', bash '4.2.37(1)-release (x86_64-pc-linux-gnu)'.
Autoset found secret key of first GPG_KEY entry '27A8AEC1' for signing.
Test - Encrypt to 27A8AEC1 & Sign with 27A8AEC1 (OK)
Test - Decrypt (OK)
Test - Compare (OK)
Cleanup - Delete '/tmp/duply.442990.1413752402_*'(OK)
--- Start running command FULL at 23:00:02.330 ---
Reading globbing filelist /root/.duply/diladele/exclude
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: Sun Oct 12 23:00:06 2014
Reuse configured PASSPHRASE as SIGN_PASSPHRASE
--------------[ Backup Statistics ]--------------
StartTime 1413752411.42 (Sun Oct 19 23:00:11 2014)
EndTime 1413780946.45 (Mon Oct 20 06:55:46 2014)
ElapsedTime 28535.03 (7 hours 55 minutes 35.03 seconds)
SourceFiles 2
SourceFileSize 6301224960 (5.87 GB)
NewFiles 2
NewFileSize 6301224960 (5.87 GB)
DeletedFiles 0
ChangedFiles 0
ChangedFileSize 0 (0 bytes)
ChangedDeltaSize 0 (0 bytes)
DeltaEntries 2
RawDeltaSize 6301220864 (5.87 GB)
TotalDestinationSizeChange 2342260248 (2.18 GB)
Errors 0
-------------------------------------------------
--- Finished state OK at 07:34:49.667 - Runtime 08:34:47.336 ---