One of my client sites has about 6 GB of files in the /uploads/ folder. She has four years of uploads, and her site generates 6 different custom thumbnail sizes every time she uploads (ugh). I just tried running a backup, and it took over an hour and then finally hung up and didn’t complete. My workaround is going to be skipping the older upload folders (and just storing one backup of them manually).
But, I was thinking it would be nice to have an option to skip all thumbnail files in the backup. They could easily be recreated by the “Recreate Thumbnails” plugin if ever necessary, and it would save a TON of time, storage, and bandwidth.
BackWPup actually has this option. Any chance you could add it to Updraft Plus?