When deleting a checkpoint, it will merge snapshot files (avhdx) that will use 1.5 spaces. For example, if avhdx uses 1TB spaces, you may need 1.5TB spaces. The space combines size of the main VHD file plus all the snapshots that you are going to merge. Therefore, before deleting checkpoint, make sure you have enough free disk space.
You can see the snapshot’s size by right clicking on it, selecting settings and then clicking on the inspect button or by visiting the folder where your aVHDX files are stored.
