Hi,
Make a copy of the license to your system. If we are concerned about the backup on the old machine, download the latest nightly backup to your system from System --> Backup page on Airwave. Do a fresh install on VM. Make sure you install the same version of Airwave which you had on PC, if you have the plan to restore. To restore copy the nightly backup file which you downloaded from old Airwave to /tmp directory on the new Airwave box using winscp and execute the below command,
# amp_restore -d /tmp/<filename>
Also, Airwave license would be mapped to your IP address. If you are using the same IP on the new server you can use the same license key. In case you have plan to use a different IP address, please contact our welcome center and provide them with the old key and new IP, they will generate a new license for you mapping to the new IP address.
Please feel free to let me know if you have any queries.