back up two macs on one external hard drive and encrypt both back ups
I am trying to back up 2 macs to one external hard disk. I am using time machine on both. when i backed up the first mac, i checked encrypt disk in time machine and set up a password. when i try to back up the second mac, its says it is decrypting the disk and takes a very long time (even after the first back up). Couple of questions:
- will the disk still be encrypted
- when backing up the second mac, should I choose encrypt disk (I did not).
Would appreciate some help from anyone who has done this.
Thanks.
iMac, OS X Mountain Lion (10.8.3)