You can also use encfs to backup to a remote or local drive encrypted and have the individual files available to you to access.
We have an NFS-shared drive and to back up my emails encrypted to that drive I did this:
first mount the remote drive (create all necessary directories as needed)
sudo mount -t nfs -o noatime,nodiratime,relatime,rsize=131072,wsize=131072 192.168.1.5:/mnt/2TBEXTERNAL/media /mnt/nfs/media
then use encfs to create a folder on it, linking your local drive folder to that remote folder. Note that the idle=30 disconnects the link if idle for more than 30 minutes. A good security measure IMHO.
$ encfs --idle=30 /mnt/nfs/media/BACKUP/.thunderbird-raw /home/turgut/.thunderbird-backup
now rsync files encrypted to the nfs mount
rsync -arvhui /home/turgut/.thunderbird /home/turgut/.thunderbird-backup
Whenever you want to backup again, repeat the commands..
To restore you can use the opposite:
rsync-arvhui /home/turgut/.thunderbird-backup /home/turgut
It's obviously slower than regular rsync, but it offers instant access to your files and everything is encrypted on the remote drive.