As I read this,another difference between these two encryption methods occurs to me. With qrecall doing the encryption, the archive volume wouldn't need to be mounted on a Mac that could decrypt it -- specifically, the archive volume could be mounted on an Airport Extreme.
When I started using Qrecall I used a single unencrypted archive drive mounted on the Airport Extreme that served my LAN, to back up both my iMac and MBP. When I decided to add a second drive and keep one offsite I encrypted both drives (using FileVault). I found that the Airport Extreme could no longer mount these drives because it couldn't decrypt them, so I had to keep the active backup mounted on the iMac. I don't know if similar considerations would apply to other forms of NAS or not.
So I'm also wondering about switching over to Qrecall encryption. On the plus side I could shut down the iMac at night, or when it isn't used for several days. On the negative, it would probably take several days to decrypt and reencrypt each 1TB+ archive. Neither choice looks clearly dominant to me right now.
This message was edited 2 times. Last update was at 05-Dec-15 23:08