Conforme especificado no Manual do VirtualBox: 1.13. Importando e exportando máquinas virtuais :
Appliances in OVF format can appear in two variants:
- They can come in several files, as one or several disk images, typically in the widely-used VMDK format (see the section called “Disk image files (VDI, VMDK, VHD, HDD)”) and a textual description file in an XML dialect with an .ovf extension. These files must then reside in the same directory for VirtualBox to be able to import them.
- Alternatively, the above files can be packed together into a single archive file, typically with an .ova extension. (Such archive files use a variant of the TAR archive format and can therefore be unpacked outside of VirtualBox with any utility that can unpack standard TAR files.)
Portanto, escolher .ovf
exportará vários arquivos para uma única pasta. A seleção de .ova
empacota todos os itens que acabariam na pasta .ovf
em um único arquivo (geralmente bastante grande). O que você prefere ter é com você.