Openmediavault is built on debian and is excellent, has a fairly steep learning curve and its not straightforward to add already full HDD’s (it really needs to control the formating and labelling of its disks to be stable).
I have an Atomic Pi (low power quad core Atom CPU) running OpenMediaVault as my NAS, it also runs TVHeadend with COMSkip, Pi-Hole, SQUID server and UrBackup. Cannot however vouch for how well it runs on ARM based hardware. I believe it has a well supported port on the RaspPi’s.
Shoog