My storage node was installed on Linux (long before me)

How do i manage it.
What commands do i use
What things to look out for.
What to check daily or weekly.
what do i monitor
how to check for errors.

ETC.

example i got the message below .................  and i dont know what it
means?

Waiting for more available space on filesystem
`rd=backup-sn:/data/hddbkp/_AF_readonly'

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