I don't believe there is. What type of retention are you trying to achieve? If you need extremely long retention then Meraki cameras may not be the best bet at this point. But using the "Enable motion-based retention? Deletes footage older than 3 days in which no motion was detected." Adds quite a bit more duration to the recordings than you'd normally get.
Adam R MS | CISSP, CISM, VCP, MCITP, CCNP, ITILv3, CMNO If this was helpful click the Kudo button below If my reply solved your issue, please mark it as a solution.
This is exactly what I wanted to do with Meraki cameras. In my case I would like grab just one picture per day and to send it to some external storage or CLOUD space. A customer wants to send captured a "building proces" on the construction yard.