Hi Julien,
pls. note, that we don't know your current system configurations and can't guess your partition management. It is actually not really relevant, how you mounted "/tmp" on your system, it is just clear, that you have insufficient space for the backup - procedure at "/tmp", why
@IgorG suggested, to define another location for "
DUMP_D" and "
DUMP_TMP_D", so that Plesk doesn't crash any more during the procedure. I guess, that it is only "/tmp", which is mounted on your boot partition, so I recommend for example:
DUMP_TMP_D /var/lib/psa/tmp
AFTER you created the folder with the command:
mkdir -p /var/lib/psa/tmp
Note, that the two locations "
DUMP_D" and "
DUMP_TMP_D" may be located anywhere on your system, at all available partitions.