$ sudo apt install exfatprogs
$ sudo apt autoremove
$ sudo mkfs.exfat -L DDBAK /dev/sda2
$ sudo mkdir /mnt/bak
$ echo '/dev/sda2 /mnt/bak exfat defaults,nosuid,nodev,gid=24,fmask=0007,dmask=0007,uhelper=udisks2 0 0' | sudo tee -a /etc/fstab
$ sudo mount /mnt/bak/
$ mount | grep /dev/sda2
/dev/sda2 on /mnt/bak type exfat (rw,nosuid,nodev,relatime,gid=24,fmask=0007,dmask=0007,allow_utime=0020,iocharset=utf8,errors=remount-ro,uhelper=udisks2)