Nextcloud Client on Server - NextcloudPi

Is there a problem running nextcloud client on nextcloud Server?
Or should i better use linux standard sync functions? (Rsync etc? → Don’t have expirience)

I run nextcloud pi on RaspPi 4 8GB.

Why i want to do this:
I have music on external normal HDD (No Server Disk) this is my nextcloud storage.
I’m afraid harddisk will be destroyed because of 50-100 starts a day.
Because of this i want to sync the Music to a SSD also on the nextcloud Pi Server.