The short answer
No. Your data. Shrink it from its app; don’t delete the folder.
What is it?
UTM stores each virtual machine as a .utm package in ~/Library/Containers/com.utmapp.UTM/Data/Documents. Each package contains the VM’s disks and settings: a whole Linux, Windows or macOS system with your files. Typically 10–100 GB each.
Whole computers with your files inside. Offload to an external drive; never deleted automatically.
What happens if you delete it?
No. A deleted VM cannot be rebuilt; you would have to install the guest system again and restore your files.
How to remove it properly
In UTM, right-click a VM you no longer need and choose Delete. To keep it but free space on the Mac, shut it down and move the .utm package to an external drive, then open it from there in UTM.
Better moved to an external drive than deleted.
Before you delete it
Copy out your files first, and make sure the VM is fully shut down, not paused.
How MoreRoom helps
MoreRoom recognises this as your data and never suggests deleting it. It shows how much space it takes, so you can shrink it from its own app.
Frequently asked questions
Can I delete UTM virtual machines on Mac?
No. Your data. Shrink it from its app; don’t delete the folder. No. A deleted VM cannot be rebuilt; you would have to install the guest system again and restore your files.
Will UTM virtual machines come back after I delete it?
No. No. A deleted VM cannot be rebuilt; you would have to install the guest system again and restore your files.
How do I remove UTM virtual machines properly?
In UTM, right-click a VM you no longer need and choose Delete. To keep it but free space on the Mac, shut it down and move the .utm package to an external drive, then open it from there in UTM.