Anyways, closest thing to what you're asking for is savegame manager gx. It has an option to extract all saves and IIRC it also has an option to install all saves. Note, in order to copy a save file to a Wii, the game in question must have been launched at least once on that specific Wii.
I'm going to test it now.
Is there any special magic required to browse SD (non SDHC) card under SGM-GX?
"Reload SD" icon does nothing. Screen only fades out/in very fast.
From top menu i can only choose "usb1/Wii/Mii".
SGM-GX uses IOS249 which is d2x v8 IOS56 based.
This is main SD card which works under HBC/Cfg/BootMii/d2x installer.
Another issue is related to "custom paths" from "settings menu".
I'm unable to clear current path, letter "u" stays from "usb1:/".
Even hitting "clear" icon won't help.
if the purpose is to backup your saves in case of disaster... why not take it one step further and just make a bootmii nand backup? then in case of disaster you can restore not only your game saves but everything.
Why not just do a nand backup?
Do not worry. I have nand backup (and keys) stored in 3 different places. Zipped for crc32 check sums.
Problem is that nand backup takes lots of time and space (encrypted data compress badly). It also does not support usb device as target.
I believe that SMG-GX will get automatic_backup_mode described in first post much sooner than bootmii.
You need to do a nand backup anyway, but just to cover your saves, click Backup All in SGM GX, then zip "savegames" on your computer. You could add the date to the name if you want.
Main idea is to make backup fast and efficient without any additional steps.