Keep 3 copies of your data, on 2 different media types, with 1 copy located off-site (or in the cloud).
While 32-bit backups often used 4 KB or 8 KB blocks, Virtual Backup 64 can use 1 MB or even 16 MB blocks for sequential writes, drastically improving throughput on spinning disks and object storage. virtual backup 64
The "64" version is specifically built for 64-bit applications and environments , which is the standard for most modern Android devices and games. Step-by-Step Guide Keep 3 copies of your data, on 2
Saving the current state/data of an app from one virtual environment to your phone's internal storage. Keep 3 copies of your data
“Virtual Backup 64 — The lightweight, 64-bit backup engine.”