A bit costly for those SD adaptors now
An issue that may come up though is that not all SD cards will work but this is due to the software as older versions of the SD software will work with more cards
Yeah you can just copy saves from one VMU to another or to a memcard I also use a SD adaptor that I got for less than a £5 but this was when they first started doing those, not that hard to wire in your own as well though if you feel you can do that yourself
There are other back up options though to PC but these are not cheaper and will require older hardware PC side as well, I have Nexus Memcard that was designed to do this but that uses a Printer type serial port to copy the data through plus those are hard to find or at least my memcard is there is a smaller one but that is still around £15 and uses old cables that newer PC hardware does not support
I would say that an SD is still the cheapest option
Yet to try save backups on my newer Dreamcast setup that uses a USB HDD instead of a GD-Rom drive but I am sure I would be able o backup saves to the HDD (that is not a cheap device though, worth it but not cheap)
Dream Explorer is maybe the only option that you have that might and that is a big might be able to restore data, is also backup software to PC but again you need extra things to do that that are not cheap in the slightest but it can also compress saves to be restored later along with other handy stuff
https://bswirl.kitsunet.org/vmutool/...?lg=en&menu=on
if anything though they also have tons of saves so you should be able to at least use complete saves from them if that is what you lost