Ce lien WebDav mène au même contenu que mon dossier Nextcloud. Y'a doublon. Je ne vois pas où c'est stocké, mais y'a doublon.
Quant au fichier /etc/fstab, il contient ceci :
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda2 during installation
UUID=ec5b8106-2f05-47f0-b945-3429d933c63a / ext4 errors=remount-ro 0 1
# /boot/efi was on /dev/sda1 during installation
UUID=7348-0967 /boot/efi vfat umask=0077 0 1
/swapfile none swap sw 0 0
(post modifié, je m'étais trompé de machine)