Is there a way of copying aof file with command ?

[ahmetagilkaya]

I need to backup aof files. Is there a command of copying the aof file?

[tidwall]

There is the AOF command. It allows for downloading part of all of the AOF file. It's not designed for a straight up copy of the data though, it's actually meant for followers to replicate the data in realtime.

If you have access to the machine then it may be better to copy the aof file directly, which is safe to do while the server is operating.