How to allocate more space for mastercontaincer?

I’m seeing this warning (see below). What can I do to allocate more space for mastercontainer? It’s a terabyte drive and only 4% of space has been used, so the actual partition has plenty of space.

2025-03-03T04:00:28.258608812Z The drive that hosts the mastercontainer volume has less than 5 GB free space. Container updates and backups might not succeed due to that!
  • Nextcloud Server version (e.g., 29.x.x):
    • Nextcloud AIO v10.6.1
  • Operating system and version (e.g., Ubuntu 24.04):
    • Fedora 41 server
  • Web server and version (e.g, Apache 2.4.25):
    • Whichever Apache comes with Nextcloud AIO v10.6.1
  • Reverse proxy and version _(e.g. nginx 1.27.2)
    • no reverse rpoxy used
  • PHP version (e.g, 8.3):
    • Whichever coems with Nextcloud AIO v10.6.1
  • Is this the first time you’ve seen this error? (Yes / No):
    • yes
  • When did this problem seem to first start?
    • After first backup
  • Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
    • AIO
  • Are you using CloudfIare, mod_security, or similar? (Yes / No)
    • no

2025-03-03T04:00:28.258608812Z The drive that hosts the mastercontainer volume has less than 5 GB free space. Container updates and backups might not succeed due to that!