I'm sorry to hear that but your instance is running out of space. You can now remove the backup folder
wpbackupsam so you have some free space in the machine. This way, you can start the services again.
In the case of WordPress, you can easily create a copy of all your data using the Migration plugin
Unfortunately, that's not a free plugin. You could follow the next guide to increase the disk size later.
Once you have enough space in the machine, you can create a full backup of the installation again.
I hope this information helps.