I'm not sure I'm onboard.
Anyone actually making recordings is likely to be using a LOT of drive space. Nightly backups have seven copies. Seven copies of ALL the recordings on the drive, which defy compression as MP3's do, would more likely than not cause a lot of places who turn that feature on to fill their HD even if they have a 1T HD or larger. Whereas the FTP Push (which already exists) allows moving the recordings to ANY other server, including the archive server, and keeping a single copy. If redundancy is requires, there's the FTP2 script. If "mission critical" redundancy is required, a mirror of that FTP server's HD is likely in place.
But I've seen too many clients fill their HDs during the nightly backup just because they're archiving their VM, I'm pretty sure it would cause a lot more problems if Recordings were an option. Too many "hey, I think that sounds like a good idea! Lets back up everything" reflexes out there.
IMHO
and it's not like it's hard to back up a folder with tar -xzf anyhoo. lol. It's not like there is some sort of requirement to also grab web files and configuration files for asterisk and linux ... these are just folders with recordings in them. Honestly if you can't figure out how to back those up using tar ... you should probably just be using the FTP scripts built in to the exiting Vicidial core.