When you create a Safe on a local NTFS drive, the option "Drive grows dynamically" option is available during Safe creation. A dynamically growing Safe initially occupies very little space on the disk and grows dynamically as you copy files to the Safe. In this way, you can save disk space and significantly speed up Safe creation.
Once the Safe has reached the maximum size you specified during creation, it stops growing and then behaves like a normal Safe.
Please note: Growing Safes cannot be used in conjunction with cloud storage or external drives. As soon as a growing Safe is moved or copied to another location, it loses its special properties and immediately occupies its maximum storage capacity, no matter how large the actual Safe contents are at the time.