backup failed

RouterOS General
1

i have a rb433ah
when i run system backup save file=server

i get the following

cho: backup,critical failed to write backup
action failed (6)
[carol@Volthan Wi-Fi Server] > system backup save name=server-new-ppptp
Saving system configuration
Failed to save system configuration backup
echo: backup,critical failed to write backup
action failed (6)
[carol@Volthan Wi-Fi Server] > system backup save name=server
Saving system configuration
Failed to save system configuration backup
echo: backup,critical failed to write backup
action failed (6)
[carol@Volthan Wi-Fi Server] > system backup
[carol@Volthan Wi-Fi Server] /system backup> save name=server1
Saving system configuration
Failed to save system configuration backup
action failed (6)
[carol@Volthan Wi-Fi Server] /system backup>

can anyone help me fix the as i cant save my config now

2 
/system resource print

and check free-hdd-space…

3

thanks it was that no space left

4

thanks it was that no space left

5

i have a same problem but I have space