qcow2 is a newer adaptation of the qcow copy-on-write format. QEMU can use a abject angel which is read-only, and abundance all writes to the qcow2 image. Among the QEMU accurate formats, this is the best able format. Use it to accept abate images (useful if your filesystem does not abutment holes, for archetype on FAT32), alternative AES encryption, zlib based compression and abutment of assorted VM snapshots.
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