Upgrading from nightly?

[genesisrage]

how can you upgrade nightly builds, either from nightly -> nightly or nightly -> RCx...

the normal nightly upgrade doesnt effect the daemon or anything, just the gui so its not that productive.

im currently using r1067 and would like to just switch to RC4, im in a semi-production environment so i cant just wipe it all out.

wondering if this would work:
1) backup mail and web folders
2) drop databases
3) do fresh install of RC4
4) recreate users in gui (only have like 3 of them)
5) then restore the mail and web folder