Updated to 11.0.2 maintaining backup after doing an update

Manually migrated from 11.0.0 to 11.0.2. Started years ago on owncloud. Everything is running fine.
Can I delete my previous backup directories? Any reason to keep them? The videos in the backup is occupying too much space and there will be data redundancy soon in the future.

My data outside of /var/www/owncloud/ and is a raid5 mount point at
/mnt/raid5/owncloud/data/owncloud/* and my backup is at

~/Documents/backup/owncloud-raid5_data-dirbkp_date +"%Y%m%d"/*