BGSAVE
Syntax
BGSAVE SAVE [RDB|DF] [cloud_uri] [filename]
Time complexity: O(1)
ACL categories: @admin, @slow, @dangerous
Equvalent to SAVE and kept for compatibility reasons.
Return
Simple string reply: Background saving started
if BGSAVE
started correctly or Background saving scheduled
when used with the SCHEDULE
subcommand.