Create raw backups on non-btrfs targets about btrbk HOT 6 CLOSED

> [btrfs]   target: vuplus:/media/hdd/sysiphus/btrbk
### 'btrfs' 'send' '-v' '/mnt/homealt/btrbk_snapshots/btrfs_vuuno.20160411' | 'xz' | 'gpg' '--batch' '--no-tty' '--trust-model' 'always' '--no-default-keyring' '--keyring' '/etc/btrbk/pubring.gpg' '--default-recipient' '[email protected]' '--encrypt' | '/usr/bin/ssh' '-C' '-i' '/root/.ssh/id_rsa' 'root@vuplus' 'dd' 'status=none' 'of=/media/hdd/sysiphus/btrbk/btrfs_vuuno.20160411--06cf54d6-354b-1f48-bbc1-994b27a3bea3.btrfs.xz.gpg'
At subvol /mnt/homealt/btrbk_snapshots/btrfs_vuuno.20160411
BusyBox v1.23.2 (2016-01-19 01:28:06 CET) multi-call binary.

Usage: dd [if=FILE] [of=FILE] [ibs=N] [obs=N] [bs=N] [count=N] [skip=N]
    [seek=N] [conv=notrunc|noerror|sync|fsync]

Copy a file with converting and formatting

    if=FILE     Read from FILE instead of stdin
    of=FILE     Write to FILE instead of stdout
    bs=N        Read and write N bytes at a time
    ibs=N       Read N bytes at a time
    obs=N       Write N bytes at a time
    count=N     Copy only N input blocks
    skip=N      Skip N input blocks
    seek=N      Skip N output blocks
    conv=notrunc    Don't truncate output file
    conv=noerror    Continue after read errors
    conv=sync   Pad blocks with zeros
    conv=fsync  Physically write data out before finishing
    conv=swab   Swap every pair of bytes

N may be suffixed by c (1), w (2), b (512), kD (1000), k (1024), MD, M, GD, G

gpg: [stdout]: write error: Datenübergabe unterbrochen (broken pipe)
gpg: DBG: deflate: iobuf_write failed
gpg: build_packet failed: Dateischreibfehler
gpg: [stdout]: write error: Datenübergabe unterbrochen (broken pipe)
gpg: DBG: deflate: iobuf_write failed
gpg: [stdout]: write error: Datenübergabe unterbrochen (broken pipe)
gpg: iobuf_flush failed on close: Dateischreibfehler
gpg: [stdin]: encryption failed: Dateischreibfehler
Command execution failed (exitcode=1): "'btrfs' 'send' '-v' '/mnt/homealt/btrbk_snapshots/btrfs_vuuno.20160411' | 'xz' | 'gpg' '--batch' '--no-tty' '--trust-model' 'always' '--no-default-keyring' '--keyring' '/etc/btrbk/pubring.gpg' '--default-recipient' '[email protected]' '--encrypt' | '/usr/bin/ssh' '-C' '-i' '/root/.ssh/id_rsa' 'root@vuplus' 'dd' 'status=none' 'of=/media/hdd/sysiphus/btrbk/btrfs_vuuno.20160411--06cf54d6-354b-1f48-bbc1-994b27a3bea3.btrfs.xz.gpg'"
ERROR: Failed to send btrfs subvolume to raw file: /mnt/homealt/btrbk_snapshots/btrfs_vuuno.20160411  -> vuplus:/media/hdd/sysiphus/btrbk/btrfs_vuuno.20160411--06cf54d6-354b-1f48-bbc1-994b27a3bea3.btrfs.xz.gpg
ERROR: Error while resuming backups, aborting
Resumed 0/3 missing backups
WARNING: Skipping cleanup of snapshots for subvolume "/mnt/homealt/btrfs_vuuno", as at least one target aborted earlier
Completed within: 2s  (Mon Apr 11 20:57:13 2016)
Closing transaction log