Snap Nextcloud Backup

hi @all,

i am testing nextcloud since 6 months.
i have installed and tried many versions.
the normal (classic) one, the version with docker and with snappy
the ready to use appliance was funny, but i think it is not the best decision for me.

provising and administering snap is really easy. so i have decided to use it in the future.
but some issues have occured
i am looking for a backup possibility.
nextcloud runs o a normal (old) pc. it is not virtualized.
i want to write or have a script where i can easily use it for a backup
if possible backing up on o running system
my backup device is a normal external hard drive.
does anyone have an idea?
i am sorry for my english skills. however i am looking forward to be better!

thank you!