It costs me $11/month. $6 for a small DO droplet instance[1] and $5 for DO spaces storage[2] which gets me 250GB of space.
I use both the instance and the storage also for other purposes. E.g. I also host my personal blog and store backups there.
If you want to save a few dollars, you can get it close to $5/month if you go with cheaper S3 compatible storage from Backblaze[3] or Cloudflare[4] + the cheapest $2.5 instance from Vultr[5].