Hello! So pretty much, I have some large folders, mostly collections of my pictures, videos, music, work projects, important documents, etc.. all on my external hard drive.. Most of the content in these are just things that I want to keep forever, but may be not using very frequently (hoarder of memories lol).. I've heard that it's generally safer to transfer large folders with many files and subfolders in .zip and .rar format, as to protect anything going wrong when moving 100,000+ files at once.. Both .zip and .rar are cool, but what about .iso? I know that .iso creates a "disk image", like things such as DVD backups, installation disks, etc., so I was wondering if it would be a smart idea to save all of these massive 100,000+ file each collections as .iso format to protect the overall contents.. I am looking for something that will provide zero compression (no data loss), will not affect the quality of my stored images, or photos, and will be "safer" to use when doing large-scale file/folder migrations or backups.. What do you guys think?