[BackupPC-users] problem with backuppc_archivestart on mounted directory

hi there,

i'm trying to archive backups to a mounted directory. the directory is a remote 
ftp mounted via curlftpfs.
first of all, if i use the web interface it works like a charm. but if i try to 
start it from the shell, i get this error:


Executing&#58; /usr/share/backuppc/bin/BackupPC_archiveHost 
/usr/share/backuppc/bin/BackupPC_tarCreate /usr/bin/split&nbsp; localhost 5 
/bin/gzip .gz 0000000 /mnt/stratoftp 0 *
Xfer PIDs are now 27834
Writing tar archive for host localhost, backup #5 to output file 
/mnt/stratoftp/localhost.5.tar.gz

gzip&#58; stdout&#58; Input/output error
Executing&#58; /bin/sh -c /usr/share/backuppc/bin/BackupPC_tarCreate -t -h 
localhost -n 5 -s \* . | /bin/gzip > /mnt/stratoftp/localhost.5.tar.gz
Error&#58; /usr/share/backuppc/bin/BackupPC_tarCreate, compress or split failed
Archive failed&#58; Error&#58; /usr/share/backuppc/bin/BackupPC_tarCreate, 
compress or split failed


and the weird thing is, if i execute the failing command from the shell 
directly, it works too:


su backuppc
/usr/share/backuppc/bin/BackupPC_tarCreate -t -h localhost -n 5 -s \* . | 
/bin/gzip > /mnt/stratoftp/localhost.5.tar.gz


this does work. but i would like to have the archive log etc in my web 
interface, so i'm trying to start it like this:


su backuppc -c "/usr/share/backuppc/bin/BackupPC_archiveStart archiveftp 
backuppc localhost"


but this fails with the mentioned error message. im kind of confused.

regards
benjamin

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