I have had minimal issues with SD cards but I always buy name brand --- and I have 2 copies just in case. Plus, the working data is also stored on my in-house n

I have had minimal issues with SD cards but I always buy name brand --- and I have 2 copies just in case. Plus, the working data is also stored on my in-house network. The first thing I do with any new memory card is reformat it. Many (if not most) cheapo, off brand, Chinese cards won't even format properly. Either the stated capacity is being faked outright or the card was a factory reject with bad blocks that shouldn't have been sold. Do not buy --- end of story. In any case, my xcopy update script will totally rebuild the backup from network source if I decide to replace one of the cards with a new empty one. I replace at the first sign of trouble but this has only occurred every few years.