BBAI backup showing error 15
While trying to backup from a Kiwi BBAI installation to a 16Gb micro-SD card the process halted at rsync: / -> /tmp/rootfs/ with each time showing writing to [/dev/mmcblk0] failed... Tried another 16 and then 48 Gb card with the same result. These cards have only been used for backups mostly for KIwi BBG installs and should not have any bad sectors.
Any suggestions what else can be tried? Thanks.