How to delete bwdata-backup folder

My server ran out of space on self-hosted BW.
ncdu shows me the folder /home/ubuntu/bwdata-backup takes 21.GB and my bwdata folder is 52.8GB, which seems huge to me. I don’t understand what’s all that storage use.

What is the correct/safe way to delete the bwdata-backup without breaking the software?

I noticed its mostly log files that were filling up the space so I removed log files older than 90 days from both bwdata and bwdata-backup dirs:

sudo find /home/ubuntu/bwdata-backup/logs/mssql/ -type f -mtime +90 -exec rm {} \;
sudo find /home/ubuntu/bwdata/logs/mssql/ -type f -mtime +90 -exec rm {} \;