Delete Old Logs / Backups?

Hey all, I was going to install the latest update to Ghost today, but realized I’ve run out of disk space on my 25gb Linode server I’m self-hosting from. My Ghost instance is the only thing I’m using the server for, so I’m a little surprised to have run out of space!

Are there any items I could delete to clear out enough space to update? Or do I simply have to upgrade my server if I want to update Ghost any further?